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74ACT157
QUAD 2 CHANNEL MULTIPLEXER
PRELIMINARY DATA
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HIGH SPEED: tPD = 5.5 ns (TYP.) at VCC = 5V LOW POWER DISSIPATION: ICC = 8 A (MAX.) at TA = 25 oC COMPATIBLE WITH TTL OUTPUTS VIH = 2V (MIN), VIL = 0.8V (MAX) 50 TRANSMISSION LINE DRIVING CAPABILITY SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 24 mA (MIN) BALANCED PROPAGATION DELAYS: tPLH tPHL OPERATING VOLTAGE RANGE: VCC (OPR) = 4.5V to 5.5V PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 157 IMPROVED LATCH-UP IMMUNITY
B M (Plastic Package) (Micro Package) ORDER CODES : 74ACT157B 74ACT157M
DESCRIPTION The ACT157 is an high-speed CMOS QUAD 2-CHANNEL MULTIPLEXER fabricated with sub-micron silicon gate and double-layer metal wiring C2MOS technology. It is ideal for low power applications maintaining high speed operation similar to equivalent Bipolar Schottky TTL. It consists of four 2-input digital multiplexers with PIN CONNECTION AND IEC LOGIC SYMBOLS
common select and strobe inputs. It is a non-inverting multiplexer. When the STROBE input is held High selection of data is inhibit and all the outputs become low. The SELECT decoding determines whether the A or B inputs get routed to their corresponding Y outputs. The device is designed to interface directly High Speed CMOS systems with TTL, NMOS and CMOS output voltage levels. All inputs and outputs are equipped with protection circuits against static discharge, giving them 2KV ESD immunity and transient excess voltage.
May 1997
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74ACT157
INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION
PIN No 1 2, 5, 11, 14 3, 6, 10, 13 4, 7, 9, 12 15 8 16 SYMBOL SELECT 1A to 4A 1B to 4B 1Y to 4Y STROBE GND VCC NAME AND F UNCTIO N Common Data Select Input Data Inputs From Source A Data Inputs From Source B Multiplexer Outputs Strobe Input Ground (0V) Positive Supply Voltage
TRUTH TABLE
INPUT ST ROBE H L L L L
X: "H" or "L"
O UTPUT A X L H X X B X X X L H Y L L H L H
SELECT X L L H H
ABSOLUTE MAXIMUM RATING
Symbol VCC VI VO IIK IOK IO ICC or IGND Tstg TL Supply Voltage DC Input Voltage DC Output Voltage DC Input Diode Current DC Output Diode Current DC Output Current DC VCC or Ground Current Storage Temperature Lead Temperature (10 sec) Parameter Value -0.5 to +7 -0.5 to VCC + 0.5 -0.5 to VCC + 0.5 20 20 50 200 -65 to +150 300 Unit V V V mA mA mA mA
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C C
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 VCC VI VO Top dt/dv Supply Voltage Input Voltage Output Voltage Operating Temperature: Input Rise and Fall Time VCC = 4.5 to 5.5V (note 1) Parameter Valu e 4.5 to 5.5 0 to VCC 0 to VCC -40 to +85 8 Unit V V V
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C
ns/V
1) VIN from 0.8 V to 2.0 V
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DC SPECIFICATIONS
Symbol Parameter V CC (V) VIH VIL VOH High Level Input Voltage Low Level Input Voltage High Level Output Voltage 4.5 5.5 4.5 5.5 4.5 5.5 4.5 5.5 VOL Low Level Output Voltage 4.5 5.5 4.5 5.5 II ICCT ICC IOLD IOHD Input Leakage Current Max ICC /Input Quiescent Supply Current Dynamic Output Current (note 1, 2) 5.5 5.5 5.5 5.5 VI = VIH or VIL
(*)
Test Con dition s
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Value T A = 25 C Min. Typ. 1.5 1.5 1.5 1.5 4.4 5.4 3.86 4.86 0.001 0.001 0.1 0.1 0.36 0.36 0.1 0.6 8 4.49 5.49 0.8 0.8 4.4 5.4 3.76 4.76 0.1 0.1 0.44 0.44 1 1.5 80 75 -75 Max. -40 to 85 C Min . 2.0 2.0 0.8 0.8 Max.
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Unit
VO = 0.1 V or VCC - 0.1 V VO = 0.1 V or VCC - 0.1 V VI = VIH or VIL
(*)
2.0 2.0
V V V
IO=-50 A IO=-50 A IO=-24 mA IO=-24 mA IO=50 A IO=50 mA IO=24 mA IO=24 mA
V
VI = VCC or GND VI = VCC -2.1 V VI = VCC or GND VOLD = 1.65 V max VOHD = 3.85 V min
A mA A mA 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 50 . (*) All outputs loaded.
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AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, RL = 500 , Input tr = t f =3 ns)
Symbol Parameter V CC (V) tPLH tPHL tPLH tPHL tPLH tPHL Propagation Delay Time SELECT to Y Propagation Delay Time STROBE to Y Propagation Delay Time A, B to Y 5.0(*) 5.0(*) 5.0
(*)
T est Cond ition
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Value -40 to 85 C T A = 25 C Min. Typ. Max. Min . Max. 1.5 5.5 9.0 1.0 10.0 1.5 1.5 5.0 4.0 8.5 7.0 1.0 1.0 9.0 8.5
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Unit
ns ns ns
(*) Voltage range is 5V 0.5V
CAPACITIVE CHARACTERISTICS
Symbol Parameter V CC (V) CIN CPD Input Capacitance Power Dissipation Capacitance (note 1) 5.0 5.0 Test Con dition s
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Value T A = 25 C Min. Typ. 4 TDB Max. -40 to 85 C Min . Max.
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Unit
pF pF
1) CPD is defined as the value of the IC's internal equivalent capacitance which is calculated from the operating current consumption without load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. ICC(opr) = CPD * VCC * fIN + ICC/n (per circuit)
TEST CIRCUIT
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74ACT157
WAVEFORM 1: PROPAGATION DELAYS FOR INVERTING CONDITIONS
WAVEFORM 2: PROPAGATION DELAYS FOR NON-INVERTING CONDITIONS
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Plastic DIP-16 (0.25) MECHANICAL DATA
mm MIN. a1 B b b1 D E e e3 F I L Z 3.3 1.27 8.5 2.54 17.78 7.1 5.1 0.130 0.050 0.51 0.77 0.5 0.25 20 0.335 0.100 0.700 0.280 0.201 1.65 TYP. MAX. MIN. 0.020 0.030 0.020 0.010 0.787 0.065 inch TYP. MAX.
DIM.
P001C
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74ACT157
SO-16 MECHANICAL DATA
DIM. MIN. A a1 a2 b b1 C c1 D E e e3 F G L M S 3.8 4.6 0.5 9.8 5.8 1.27 8.89 4.0 5.3 1.27 0.62 8 (max.) 0.149 0.181 0.019 10 6.2 0.35 0.19 0.5 45 (typ.) 0.385 0.228 0.050 0.350 0.157 0.208 0.050 0.024 0.393 0.244 0.1 mm TYP. MAX. 1.75 0.2 1.65 0.46 0.25 0.013 0.007 0.019 0.004 MIN. inch TYP. MAX. 0.068 0.007 0.064 0.018 0.010
P013H
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74ACT157
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsability for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may results from its use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersede and replaces all information previously supplied. s SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectonics. (c) 1997 SGS-THOMSON Microelectronics - Printed in Italy - All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A .
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