74AC244 _SGS Thomson

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74AC244

OCTAL BUS BUFFERWITH 3 STATE OUTPUTS (NON INVERTED)

April 1997

HIGH SPEED tPD = 4 ns (TYP) atVCC = 5V

LOW POWER DISSIPATIONICC = 8 microA (MAX) at TA = 25 oC

HIGH NOISE IMMUNITYVNIH = VNIL = 28 VCC (MIN)

50Ω TRANSMISSION LINE DRIVINGCAPABILITY

SYMMETRICAL OUTPUT IMPEDANCE

|IOH| = IOL = 24 mA (MIN) BALANCED PROPAGATION DELAYS

tPLH cong tPHL

OPERATING VOLTAGE RANGEVCC (OPR) = 2V to 6V

PIN AND FUNCTION COMPATIBLEWITH74 SERIES 244

IMPROVED LATCH-UP IMMUNITY

DESCRIPTIONThe AC244 is an advanced CMOS OCTAL BUSBUFFER (3-STATE) fabricated with sub-micronsilicon gate and double-layer metal wiring C2MOS

technology It is ideal for low power applications

mantaining high speed operation similar toequivalent Bipolar Schottky TTLG control output governs four BUS BUFFERs

This device is desibned to be used with 3 statememory address drivers etc

All inputs and outputs are equipped withprotection circuits against s tatic discharge givingthem 2KV ESD immunity and transient excessvoltage

PIN CONNECTION AND IEC LOGIC SYMBOLS

M(Micro Package)

B(Plastic Package)

ORDER CODES

74AC244B 74AC244M

18



INPUT AND OUTPUT EQUIVALENT CIRCUIT

TRUTH TABLE

INPUT OUT PUT

G An Yn

L L L

L H H

H X ZXrdquoHrdquo or rdquoLrdquoZ High impedance

PIN DESCRIPTION

P IN N o S YM BO L N AM E A ND F UNC TI O N

1 1G Output Enable Input246 8 1A1to1A4 Data Inputs

975 3 2Y1to2Y4 Data Outputs

11 13 15 17 2A1 to2A4 Data Inputs

18 16 14 12 1Y1 to1Y4 Data Outputs

19 2G Output Enabel Input

10 GND Ground (0V)

20 VCC Positive Supply Voltage

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Uni t

VCC Supply Voltage -05 to +7 VVI DC Input Voltage -05 to VCC + 05 V

VO DC Output Voltage -05 to VCC + 05 V

IIK DC Input Diode Current plusmn 20 mA

IOK DC Output Diode Current plusmn 20 mA

IO DC Output Current plusmn 50 mA

ICC orIGND DC VCC or Ground Current plusmn 400 mA

Tstg Storage Temperature -65 to +150 oC

TL Lead Temperature (10 sec) 300 oC

Absolute Maximum Ratings are those values beyond which damage to the device may occur Functional operation under these condition is not implied

RECOMMENDED OPERATING CONDITIONS

Symbol Parameter Value Unit

VCC Supply Voltage 2 to 6 V

VI Input Voltage 0 to VCC V

VO Output Voltage 0 to VCC V

Top Operating Temperature -40 to +85 o

C

dtdv Input Rise and Fall Time VCC = 30 45 or 55 V(note 1) 8 nsV

1) VIN from 30 to 70 of VCC

74AC244

28



DC SPECIFICATIONS

Symbol Parameter Test Conditions Value Unit

V CC(V) TA = 25

o

C -40 to 85

o

CMi n Ty p Ma x Min Max

VIH High Level Input Voltage 30 VO = 01 V orVCC - 01 V

21 15 21

V45 315 225 315

55 385 275 385

VIL Low Level Input Voltage 30 VO = 01 V orVCC - 01 V

15 09 09

V45 225 135 135

55 275 165 165

VOH High Level Output

Voltage

30

VI()=

VIH orVIL

IO=-50microA 29 299 29

V

45 IO=-50microA 44 449 44

55 IO=-50microA 54 549 54

30 IO=-12 mA 256 246

45 IO=-24 mA 386 376

55 IO=-24 mA 486 476

VOL Low Level Output

Voltage

30

VI()=

VIH or

VIL

IO=50microA 0002 01 01

V

45 IO=50microA 0001 01 01

55 IO=50microΑ 0001 01 01

30 IO=12 mA 036 044

45 IO=24 mA 036 044

55 IO=24 mA 036 044

II Input Leakage Current 55 VI = VCC orGND plusmn01 plusmn1 microA

IOZ 3 State Output Leakage

Current

55 VI = VIH or VIL

VO = VCC orGND

plusmn05 plusmn5 microA

ICC Quiescent SupplyCurrent

55 VI = VCC or GND 8 80 microA

IOLD Dynamic Output Current

(note 1 2)

55 VOLD = 165 V max 75 mA

IOHD VOHD = 385 V min -75 mA

1) Maximum test duration 2ms one output loaded at time

2) Incident wave switching is guaranteed on transmission lines with impedances as low as 50Ω

()A ll outputs loaded

74AC244

38



CAPACITIVE CHARACTERISTICS

Symb ol Parameter Test Condition s Value Unit

VCC

(V)

TA = 25 o

C -40 to 85 o

C

Min Ty p Max M in Max

CIN Input Capacitance 50 4 pF

COUT Output Capacitance 50 8 pF

CPD Power Dissipation

Capacitance (note 1)

50 21 pF

1) CPD is defined as the value of the ICrsquos internal equivalent capacitance which is calculated from the operating current consumption without load (Refer toTest Circuit) Average operating current can be obtained bythe following equation ICC(opr) = CPDbull VCCbull fIN + ICC n (per circuit)

AC ELECTRICAL CHARACTERISTICS (CL = 50 pF RL = 500 Ω Input tr = tf =3 ns)

Symbol Parameter T est Cond iti on Value Unit

V CC(V) TA = 25

o

C -40 to 85

o


tPLH

tPHL

Propagation Delay Time 33()

15 5 9 15 10ns

50() 15 4 7 15 75

tPZL

tPZH

Out put Enable Time 33() 15 6 10 15 11ns

50()

15 4 8 15 85

tPLZ

tPHZ

Out put Disable T ime 33() 15 7 11 15 12ns

50() 15 55 9 15 10() Voltagerange is 33Vplusmn 03V

() Voltage range is5Vplusmn 05V

TEST CIRCUIT

TEST SWI TCH

tPLH tPHL Open

tPZL tPLZ 2VCC

tPZH tPHZ Open

CL = 50 pF or equivalent (includes jig and probe capacitance)

RL = R1 = 500Ω or equivalent

RT = ZOUT of pulse generator (typically 50Ω)

74AC244

48



WAVEFORM 1 PROPAGATION DELAYS (f=1MHz50 duty cycle)

WAVEFORM 2 OUTPUT ENABLE AND DISABLE TIME (f=1MHz 50 duty cycle)

74AC244

58



DIMmm inch

MIN TYP MAX MIN TYP MAX

a1 0254 0010

B 139 165 0055 0065

b 045 0018

b1 025 0010

D 254 1000

E 85 0335

e 254 0100

e3 2286 0900

F 71 0280

I 393 0155

L 33 0130

Z 134 0053

P001J

Plastic DIP20 (025) MECHANICAL DATA

74AC244

68



SO20 MECHANICAL DATA

DIM mm inch


A 265 0104

a1 010 020 0004 0007

a2 245 0096

b 035 049 0013 0019

b1 023 032 0009 0012

C 050 0020

c1 45deg (typ)

D 1260 1300 0496 0512

E 1000 1065 0393 0419

e 127 0050

e3 1143 0450

F 740 760 0291 0299

L 050 127 019 0050

M 075 0029

S 8deg (max)

P013L

74AC244

78



Information furnished is believed to be accurate and reliable However SGS-THOMSON Microelectronics assumes no responsability for theconsequences of use of such information nor for any infringement of patentsor other rights of third parties whichmay resultsfrom its use Nolicense is grantedby implication or otherwise under any patent or patent rights ofSGS-THOMSON Microelectronics Specifications mentionedin this publicationare subject to change without notice This publication supersedes and replaces all information previously suppliedSGS-THOMSON Microelectronics productsare not authorized for use as criticalcomponents in life supportdevices or systems withoutexpresswritten approval of SGS-THOMSON Microelectonics

983209 1997 SGS-THOMSON Microelectronics - Printedin Italy - All Rights Reserved

SGS-THOMSON Microelectronics GROUP OF COMPANIESAustralia- Brazil - Canada - China - France- Germany- Hong Kong - Italy- Japan- Korea- Malaysia- Malta- Morocco - The Netherlands -

Singapore - Spain- Sweden - Switzerland - Taiwan - Thailand - United Kingdom- USA

74AC244

88



INPUT AND OUTPUT EQUIVALENT CIRCUIT

TRUTH TABLE

INPUT OUT PUT

G An Yn

L L L

L H H

H X ZXrdquoHrdquo or rdquoLrdquoZ High impedance

PIN DESCRIPTION

P IN N o S YM BO L N AM E A ND F UNC TI O N

1 1G Output Enable Input246 8 1A1to1A4 Data Inputs

975 3 2Y1to2Y4 Data Outputs

11 13 15 17 2A1 to2A4 Data Inputs

18 16 14 12 1Y1 to1Y4 Data Outputs

19 2G Output Enabel Input

10 GND Ground (0V)

20 VCC Positive Supply Voltage

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Uni t

VCC Supply Voltage -05 to +7 VVI DC Input Voltage -05 to VCC + 05 V

VO DC Output Voltage -05 to VCC + 05 V

IIK DC Input Diode Current plusmn 20 mA

IOK DC Output Diode Current plusmn 20 mA

IO DC Output Current plusmn 50 mA

ICC orIGND DC VCC or Ground Current plusmn 400 mA

Tstg Storage Temperature -65 to +150 oC

TL Lead Temperature (10 sec) 300 oC

Absolute Maximum Ratings are those values beyond which damage to the device may occur Functional operation under these condition is not implied

RECOMMENDED OPERATING CONDITIONS

Symbol Parameter Value Unit

VCC Supply Voltage 2 to 6 V

VI Input Voltage 0 to VCC V

VO Output Voltage 0 to VCC V

Top Operating Temperature -40 to +85 o

C

dtdv Input Rise and Fall Time VCC = 30 45 or 55 V(note 1) 8 nsV

1) VIN from 30 to 70 of VCC

74AC244

28



DC SPECIFICATIONS


V CC(V) TA = 25

o

C -40 to 85

o



21 15 21

V45 315 225 315

55 385 275 385


15 09 09

V45 225 135 135

55 275 165 165


Voltage

30

VI()=

VIH orVIL

IO=-50microA 29 299 29

V

45 IO=-50microA 44 449 44

55 IO=-50microA 54 549 54

30 IO=-12 mA 256 246

45 IO=-24 mA 386 376

55 IO=-24 mA 486 476


Voltage

30

VI()=

VIH or

VIL

IO=50microA 0002 01 01

V

45 IO=50microA 0001 01 01

55 IO=50microΑ 0001 01 01

30 IO=12 mA 036 044

45 IO=24 mA 036 044

55 IO=24 mA 036 044



Current

55 VI = VIH or VIL

VO = VCC orGND





(note 1 2)






74AC244

38





VCC

(V)

TA = 25 o

C -40 to 85 o

C






50 21 pF




V CC(V) TA = 25

o

C -40 to 85

o


tPLH

tPHL


15 5 9 15 10ns

50() 15 4 7 15 75

tPZL

tPZH


50()

15 4 8 15 85

tPLZ

tPHZ




TEST CIRCUIT

TEST SWI TCH

tPLH tPHL Open

tPZL tPLZ 2VCC

tPZH tPHZ Open




74AC244

48





74AC244

58



DIMmm inch


a1 0254 0010

B 139 165 0055 0065

b 045 0018

b1 025 0010

D 254 1000

E 85 0335

e 254 0100

e3 2286 0900

F 71 0280

I 393 0155

L 33 0130

Z 134 0053

P001J


74AC244

68




DIM mm inch


A 265 0104

a1 010 020 0004 0007

a2 245 0096

b 035 049 0013 0019

b1 023 032 0009 0012

C 050 0020

c1 45deg (typ)

D 1260 1300 0496 0512

E 1000 1065 0393 0419

e 127 0050

e3 1143 0450

F 740 760 0291 0299

L 050 127 019 0050

M 075 0029

S 8deg (max)

P013L

74AC244

78







74AC244

88



DC SPECIFICATIONS


V CC(V) TA = 25

o

C -40 to 85

o



21 15 21

V45 315 225 315

55 385 275 385


15 09 09

V45 225 135 135

55 275 165 165


Voltage

30

VI()=

VIH orVIL

IO=-50microA 29 299 29

V

45 IO=-50microA 44 449 44

55 IO=-50microA 54 549 54

30 IO=-12 mA 256 246

45 IO=-24 mA 386 376

55 IO=-24 mA 486 476


Voltage

30

VI()=

VIH or

VIL

IO=50microA 0002 01 01

V

45 IO=50microA 0001 01 01

55 IO=50microΑ 0001 01 01

30 IO=12 mA 036 044

45 IO=24 mA 036 044

55 IO=24 mA 036 044



Current

55 VI = VIH or VIL

VO = VCC orGND





(note 1 2)






74AC244

38





VCC

(V)

TA = 25 o

C -40 to 85 o

C






50 21 pF




V CC(V) TA = 25

o

C -40 to 85

o


tPLH

tPHL


15 5 9 15 10ns

50() 15 4 7 15 75

tPZL

tPZH


50()

15 4 8 15 85

tPLZ

tPHZ




TEST CIRCUIT

TEST SWI TCH

tPLH tPHL Open

tPZL tPLZ 2VCC

tPZH tPHZ Open




74AC244

48





74AC244

58



DIMmm inch


a1 0254 0010

B 139 165 0055 0065

b 045 0018

b1 025 0010

D 254 1000

E 85 0335

e 254 0100

e3 2286 0900

F 71 0280

I 393 0155

L 33 0130

Z 134 0053

P001J


74AC244

68




DIM mm inch


A 265 0104

a1 010 020 0004 0007

a2 245 0096

b 035 049 0013 0019

b1 023 032 0009 0012

C 050 0020

c1 45deg (typ)

D 1260 1300 0496 0512

E 1000 1065 0393 0419

e 127 0050

e3 1143 0450

F 740 760 0291 0299

L 050 127 019 0050

M 075 0029

S 8deg (max)

P013L

74AC244

78







74AC244

88





VCC

(V)

TA = 25 o

C -40 to 85 o

C






50 21 pF




V CC(V) TA = 25

o

C -40 to 85

o


tPLH

tPHL


15 5 9 15 10ns

50() 15 4 7 15 75

tPZL

tPZH


50()

15 4 8 15 85

tPLZ

tPHZ




TEST CIRCUIT

TEST SWI TCH

tPLH tPHL Open

tPZL tPLZ 2VCC

tPZH tPHZ Open




74AC244

48





74AC244

58



DIMmm inch


a1 0254 0010

B 139 165 0055 0065

b 045 0018

b1 025 0010

D 254 1000

E 85 0335

e 254 0100

e3 2286 0900

F 71 0280

I 393 0155

L 33 0130

Z 134 0053

P001J


74AC244

68




DIM mm inch


A 265 0104

a1 010 020 0004 0007

a2 245 0096

b 035 049 0013 0019

b1 023 032 0009 0012

C 050 0020

c1 45deg (typ)

D 1260 1300 0496 0512

E 1000 1065 0393 0419

e 127 0050

e3 1143 0450

F 740 760 0291 0299

L 050 127 019 0050

M 075 0029

S 8deg (max)

P013L

74AC244

78







74AC244

88





74AC244

58



DIMmm inch


a1 0254 0010

B 139 165 0055 0065

b 045 0018

b1 025 0010

D 254 1000

E 85 0335

e 254 0100

e3 2286 0900

F 71 0280

I 393 0155

L 33 0130

Z 134 0053

P001J


74AC244

68




DIM mm inch


A 265 0104

a1 010 020 0004 0007

a2 245 0096

b 035 049 0013 0019

b1 023 032 0009 0012

C 050 0020

c1 45deg (typ)

D 1260 1300 0496 0512

E 1000 1065 0393 0419

e 127 0050

e3 1143 0450

F 740 760 0291 0299

L 050 127 019 0050

M 075 0029

S 8deg (max)

P013L

74AC244

78







74AC244

88



DIMmm inch


a1 0254 0010

B 139 165 0055 0065

b 045 0018

b1 025 0010

D 254 1000

E 85 0335

e 254 0100

e3 2286 0900

F 71 0280

I 393 0155

L 33 0130

Z 134 0053

P001J


74AC244

68




DIM mm inch


A 265 0104

a1 010 020 0004 0007

a2 245 0096

b 035 049 0013 0019

b1 023 032 0009 0012

C 050 0020

c1 45deg (typ)

D 1260 1300 0496 0512

E 1000 1065 0393 0419

e 127 0050

e3 1143 0450

F 740 760 0291 0299

L 050 127 019 0050

M 075 0029

S 8deg (max)

P013L

74AC244

78







74AC244

88




DIM mm inch


A 265 0104

a1 010 020 0004 0007

a2 245 0096

b 035 049 0013 0019

b1 023 032 0009 0012

C 050 0020

c1 45deg (typ)

D 1260 1300 0496 0512

E 1000 1065 0393 0419

e 127 0050

e3 1143 0450

F 740 760 0291 0299

L 050 127 019 0050

M 075 0029

S 8deg (max)

P013L

74AC244

78







74AC244

88







74AC244

88

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74AC244 _SGS Thomson