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74AHC157; 74AHCT157
General 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 multiplexer 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 74AHC/AHCT157. The state of the common data select input (S) determines the particular register from which the data comes. It can also be used as 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 74AHC/AHCT157 is 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 x (1I1 x S + 1I0 x S )
- 2Y = E x (2I1 x S + 2I0 x S)
- 3Y = E x (3I1 x S + 3I0 x S)
- 4Y = E x (4I1 x S + 4I0 x S)
The 74AHC/AHCT157 is identical to the 74AHC/AHCT158 but has non-inverting (true) outputs.
Features
- Balanced propagation delays
- All inputs have a Schmitt-trigger action
- Inputs accepts voltages higher than VCC
- Multiple input enable for easy expansion
- Ideal for memory chip select decoding
- For 74AHC157 only: operates with CMOS input levels
- For 74AHCT157 only: operates with TTL input levels
- ESD protection:
- HBM JESD22-A114E exceeds 2000 V
- MM JESD22-A115-A exceeds 200 V
- CDM JESD22-C101C exceeds 1000 V
- Multiple package options
- Specified from -40 Cel to +85 Cel and from -40 Cel to +125 Cel
Products/packages
| Type number | North American Type number | Ordering code (12NC) | Product status | Package | Packing | Marking | Chemical content | Leadfree conversion date |
|---|---|---|---|---|---|---|---|---|
| 74AHC157D | 74AHC157D | 9352 639 98112 | Volume production | SOT109-1
(SO16) | Tube | Standard Marking | 74AHC157D
| |
| 74AHC157D | 74AHC157D-T | 9352 639 98118 | Volume production | SOT109-1
(SO16) | Reel Pack, SMD, 13" | Standard Marking | 74AHC157D
| |
| 74AHC157PW | 74AHC157PW | 9352 639 99112 | Volume production | SOT403-1
(TSSOP16) | Tube | Standard Marking | 74AHC157PW
| week 10, 2005 |
| 74AHC157PW | 74AHC157PW-T | 9352 639 99118 | Volume production | SOT403-1
(TSSOP16) | Reel Pack, SMD, 13" | Standard Marking | 74AHC157PW
| week 10, 2005 |
| 74AHCT157D | 74AHCT157D | 9352 640 00112 | Volume production | SOT109-1
(SO16) | Tube | Standard Marking | 74AHCT157D
| |
| 74AHCT157D | 74AHCT157D-T | 9352 640 00118 | Volume production | SOT109-1
(SO16) | Reel Pack, SMD, 13" | Standard Marking | 74AHCT157D
| |
| 74AHCT157PW | 74AHCT157PW | 9352 640 01112 | Volume production | SOT403-1
(TSSOP16) | Tube | Standard Marking | 74AHCT157PW
| week 10, 2005 |
| 74AHCT157PW | 74AHCT157PW-T | 9352 640 01118 | Volume production | SOT403-1
(TSSOP16) | Reel Pack, SMD, 13" | Standard Marking | 74AHCT157PW
| week 10, 2005 |
Pricing/ordering/availability
| Type number | Ordering code(12NC) | Indicative price/unit($) | Region | Distributor | In stock | Inventory date | Buy online | Samples |
|---|---|---|---|---|---|---|---|---|
| 74AHC157D | 9352 639 98112 | 0.2300 | NA | AVNET ELECTRONICS MARKETING | 3,380 | 7/3/2008 | Buy online | not available |
| 74AHC157D | 9352 639 98118 | 0.2300 | Order samples | |||||
| 74AHC157PW | 9352 639 99112 | 0.2300 | NA | ARROW ELECTRONICS | 2,400 | 7/3/2008 | Buy online | not available |
| 74AHC157PW | 9352 639 99118 | 0.2300 | Order samples | |||||
| 74AHCT157D | 9352 640 00112 | 0.2400 | NA | ARROW ELECTRONICS | 3,440 | 7/3/2008 | Buy online | Order samples |
| 74AHCT157D | 9352 640 00118 | 0.2400 | Order samples | |||||
| 74AHCT157PW | 9352 640 01112 | 0.2400 | not available | |||||
| 74AHCT157PW | 9352 640 01118 | 0.2400 | NA | AVNET ELECTRONICS MARKETING | 5,000 | 7/3/2008 | Buy online | Order samples |
Parametrics/similar products
| Type number | Package | Description | Propagation Delay(ns) | Voltage | No. of Pins | Power Dissipation Considerations | Logic Switching Levels | Output Drive Capability |
|---|---|---|---|---|---|---|---|---|
| 74AHC157D | SOT109-1
(SO16) | Quad 2-Input Multiplexer | 3.2@5V | 2.0-5.5 V | 16 | Low Power or Battery Applications | CMOS | +/- 8 mA |
| 74AHC157PW | SOT403-1
(TSSOP16) | Quad 2-Input Multiplexer | 3.2@5V | 2.0-5.5 V | 16 | Low Power or Battery Applications | CMOS | +/- 8 mA |
| 74AHCT157D | SOT109-1
(SO16) | Quad 2-Input Multiplexer; TTL Enabled | 3.4 | 4.5-5.5 V | 16 | Low Power | TTL | +/- 8 mA |
| 74AHCT157PW | SOT403-1
(TSSOP16) | Quad 2-Input Multiplexer; TTL Enabled | 3.4 | 4.5-5.5 V | 16 | Low Power | TTL | +/- 8 mA |
Similar products
74AHC157; 74AHCT157 links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category.
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