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74AHCT157PWDH Datasheet(PDF) 2 Page - NXP Semiconductors |
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74AHCT157PWDH Datasheet(HTML) 2 Page - NXP Semiconductors |
2 / 16 page 1999 Sep 24 2 Philips Semiconductors Product specification Quad 2-input multiplexer 74AHC157; 74AHCT157 FEATURES • ESD protection: HBM EIA/JESD22-A114-A exceeds 2000 V MM EIA/JESD22-A115-A exceeds 200 V CDM EIA/JESD22-C101 exceeds 1000 V • Balanced propagation delays • All inputs have Schmitt-trigger actions • Multiple input enable for easy expansion • Ideal for memory chip select decoding • Inputs accept voltages higher than VCC • For AHC only: operates with CMOS input levels • For AHCT only: operates with TTL input levels • Specified from −40 to +85 and +125 °C. FUNCTION TABLE See note 1. Note 1. H = HIGH voltage level; L = LOW voltage level; X = don’t care. DESCRIPTION The 74AHC/AHCT157 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard No. 7A. The 74AHC/AHCT157 are quad 2-input multiplexers which select 4 bits of data from two sources under the control of a common data select input (S). The enable input (E) is active LOW. When E is HIGH, all of the outputs (1Y to 4Y) are forced LOW regardless of all other input conditions. Moving the data from two groups of registers to four common output buses is a common use of the ‘157’. The state of the common data select input (S) determines the particular register from which the data comes. It can also be used as a function generator. The device is useful for implementing highly irregular logic by generating any four of the 16 different functions of two variables with one variable common. The ‘157’ is the logic implementation of a 4-pole, 2-position switch, where the position of the switch is determine by the logic levels applied to S. The logic equations are: 1Y = E × (1I1 × S+1I0 × S); 2Y = E × (2I1 × S+2I0 × S); 3Y = E × (3I1 × S+3I0 × S); 4Y = E × (4I1 × S+4I0 × S). The ‘157’ is identical to the ‘158’ but has non-inverting (true) outputs. INPUT OUTPUT ES nI0 nI1 nY H XXX L LLL X L LL H X H LH X L L L HXH H ORDERING INFORMATION OUTSIDE NORTH AMERICA NORTH AMERICA PACKAGES PINS PACKAGE MATERIAL CODE 74AHC157D 74AHC157D 16 SO plastic SOT109-1 74AHC157PW 74AHC157PW DH 16 TSSOP plastic SOT403-1 74AHCT157D 74AHCT157D 16 SO plastic SOT109-1 74AHCT157PW 74AHCT157PW DH 16 TSSOP plastic SOT403-1 |
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