Select site:
- English
74HC/HCT257
General description
The 74HC257; 74HCT257 is a high-speed Si-gate CMOS device and is pin compatible with Low-power Schottky TTL (LSTTL).
The 74HC257; 74HCT257 has four identical 2-input multiplexers with 3-state outputs, which select 4 bits of data from two sources and are controlled by a common data select input (S).
The data inputs from source 0 (1I0 to 4I0) are selected when input S is LOW and the data inputs from source 1 (1I1 to 4I1) are selected when S is HIGH. Data appears at the outputs (1Y to 4Y) in true (non-inverting) form from the selected inputs.
The 74HC257; 74HCT257 is the logic implementation of a 4-pole, 2-position switch, where the position of the switch is determined by the logic levels applied to S. The outputs are forced to a high-impedance OFF-state when OE is HIGH.
The logic equations for the outputs are:
2Y = OE x (2I1 x S + 2I0 x S)
3Y = OE x (3I1 x S + 3I0 x S)
4Y = OE x (4I1 x S + 4I0 x S)
The 74HC257; 74HCT257 is identical to the 74HC258 but has non-inverting (true) outputs.
Features
- Non-inverting data path
- 3-state outputs interface directly with system bus
- Complies with JEDEC standard no. 7A
- ESD protection:
- HBM EIA/JESD22-A114-C exceeds 2000 V
- MM EIA/JESD22-A115-A exceeds 200 V
- Multiple package options
- Specified from -40 Cel to +85Cel 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 |
|---|---|---|---|---|---|---|---|---|
| 74HC257D | 74HC257D | 9337 136 40652 | Volume production | SOT109-1
(SO16) | Bulk Pack, CECC | Standard Marking | 74HC257D
| week 12, 2005 |
| 74HC257D | 74HC257D-T | 9337 136 40653 | Volume production | SOT109-1
(SO16) | Reel Pack, SMD, 13", CECC | Standard Marking | 74HC257D
| week 12, 2005 |
| 74HC257DB | 74HC257DB | 9351 886 60112 | Volume production | SOT338-1
(SSOP16) | Tube | Standard Marking | 74HC257DB
| week 12, 2005 |
| 74HC257DB | 74HC257DB-T | 9351 886 60118 | Volume production | SOT338-1
(SSOP16) | Reel Pack, SMD, 13" | Standard Marking | 74HC257DB
| week 12, 2005 |
| 74HC257N | 74HC257N | 9336 695 50652 | Volume production | SOT38-4
(DIP16) | Bulk Pack, CECC | Standard Marking | 74HC257N
| Always Pb-free |
| 74HC257PW | 74HC257PW | 9351 746 80112 | Volume production | SOT403-1
(TSSOP16) | Tube | Standard Marking | 74HC257PW
| week 10, 2005 |
| 74HC257PW | 74HC257PW-T | 9351 746 80118 | Volume production | SOT403-1
(TSSOP16) | Reel Pack, SMD, 13" | Standard Marking | 74HC257PW
| week 10, 2005 |
| 74HCT257D | 74HCT257D | 9337 136 50652 | Volume production | SOT109-1
(SO16) | Bulk Pack, CECC | Standard Marking | 74HCT257D
| week 35, 2004 |
| 74HCT257D | 74HCT257D-T | 9337 136 50653 | Volume production | SOT109-1
(SO16) | Reel Pack, SMD, 13", CECC | Standard Marking | 74HCT257D
| week 35, 2004 |
| 74HCT257DB | 74HCT257DB | 9351 909 60112 | Volume production | SOT338-1
(SSOP16) | Tube | Standard Marking | 74HCT257DB
| week 12, 2005 |
| 74HCT257DB | 74HCT257DB-T | 9351 909 60118 | Volume production | SOT338-1
(SSOP16) | Reel Pack, SMD, 13" | Standard Marking | 74HCT257DB
| week 12, 2005 |
| 74HCT257N | 74HCT257N | 9336 701 80652 | Volume production | SOT38-4
(DIP16) | Bulk Pack, CECC | Standard Marking | 74HCT257N
| Always Pb-free |
| 74HCT257PW | 74HCT257PW | 9351 884 00112 | Volume production | SOT403-1
(TSSOP16) | Tube | Standard Marking | 74HCT257PW
| week 10, 2005 |
| 74HCT257PW | 74HCT257PW-T | 9351 884 00118 | Volume production | SOT403-1
(TSSOP16) | Reel Pack, SMD, 13" | Standard Marking | 74HCT257PW
| week 10, 2005 |
Pricing/ordering/availability
| Type number | Ordering code(12NC) | Indicative price/unit($) | Region | Distributor | In stock | Inventory date | Buy online | Samples |
|---|---|---|---|---|---|---|---|---|
| 74HC257D | 9337 136 40652 | 0.2600 | NA | ARROW ELECTRONICS | 3,802 | 7/3/2008 | Buy online | not available |
| NA | AVNET ELECTRONICS MARKETING | 3,000 | 7/3/2008 | Buy online | ||||
| NA | DIGI-KEY CORPORATION | 994 | 6/29/2008 | Buy online | ||||
| 74HC257D | 9337 136 40653 | 0.2600 | NA | FUTURE ELECTRONICS | 4,500 | 7/3/2008 | Buy online | Order samples |
| NA | MOUSER ELECTRONICS | 2,500 | 7/3/2008 | Buy online | ||||
| 74HC257DB | 9351 886 60112 | 0.3000 | NA | DIGI-KEY CORPORATION | 1,068 | 6/29/2008 | Buy online | not available |
| 74HC257DB | 9351 886 60118 | 0.3000 | Order samples | |||||
| 74HC257N | 9336 695 50652 | 0.2800 | NA | DIGI-KEY CORPORATION | 1,563 | 6/29/2008 | Buy online | Order samples |
| NA | ARROW ELECTRONICS | 1,200 | 7/3/2008 | Buy online | ||||
| NA | AVNET ELECTRONICS MARKETING | 633 | 7/3/2008 | Buy online | ||||
| 74HC257PW | 9351 746 80112 | 0.2600 | not available | |||||
| 74HC257PW | 9351 746 80118 | 0.2600 | Order samples | |||||
| 74HCT257D | 9337 136 50652 | 0.2500 | NA | ARROW ELECTRONICS | 1,669 | 7/3/2008 | Buy online | not available |
| 74HCT257D | 9337 136 50653 | 0.2500 | NA | ARROW ELECTRONICS | 5,000 | 7/3/2008 | Buy online | Order samples |
| 74HCT257DB | 9351 909 60112 | 0.2500 | NA | DIGI-KEY CORPORATION | 2,128 | 6/29/2008 | Buy online | not available |
| 74HCT257DB | 9351 909 60118 | 0.2500 | Order samples | |||||
| 74HCT257N | 9336 701 80652 | 0.2800 | NA | DIGI-KEY CORPORATION | 837 | 6/29/2008 | Buy online | Order samples |
| 74HCT257PW | 9351 884 00112 | 0.2500 | not available | |||||
| 74HCT257PW | 9351 884 00118 | 0.2500 | 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 |
|---|---|---|---|---|---|---|---|---|
| 74HC257D | SOT109-1
(SO16) | Quad 2-Input Multiplexer (3-State) | 11@5V | 2.0-6.0 V | 16 | Low Power or Battery Applications | CMOS | +/- 7.8 mA |
| 74HC257DB | SOT338-1
(SSOP16) | Quad 2-Input Multiplexer (3-State) | 11@5V | 2.0-6.0 V | 16 | Low Power or Battery Applications | CMOS | +/- 7.8 mA |
| 74HC257N | SOT38-4
(DIP16) | Quad 2-Input Multiplexer (3-State) | 11@5V | 2.0-6.0 V | 16 | Low Power or Battery Applications | CMOS | +/- 7.8 mA |
| 74HC257PW | SOT403-1
(TSSOP16) | Quad 2-Input Multiplexer (3-State) | 11@5V | 2.0-6.0 V | 16 | Low Power or Battery Applications | CMOS | +/- 7.8 mA |
| 74HCT257D | SOT109-1
(SO16) | Quad 2-Input Multiplexer; TTL Enabled (3-State) | 13 | 4.5-5.5V | 16 | Low Power | TTL | +/- 6 mA |
| 74HCT257DB | SOT338-1
(SSOP16) | Quad 2-Input Multiplexer; TTL Enabled (3-State) | 13 | 4.5-5.5V | 16 | Low Power | TTL | +/- 6 mA |
| 74HCT257N | SOT38-4
(DIP16) | Quad 2-Input Multiplexer; TTL Enabled (3-State) | 13 | 4.5-5.5V | 16 | Low Power | TTL | +/- 6 mA |
| 74HCT257PW | SOT403-1
(TSSOP16) | Quad 2-Input Multiplexer; TTL Enabled (3-State) | 13 | 4.5-5.5V | 16 | Low Power | TTL | +/- 6 mA |
Similar products
74HC/HCT257 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.
Disclaimer
The information published on product information pages of the www.nxp.com or www.semiconductors.com websites is an extract from product data sheets and is for information purposes only. For detailed information please check the most recent version of the relevant product data sheet as published on these websites. In the event of any conflict between product information pages and data sheets or deviations from information provided in the product data sheets on these product information pages, the information provided in the product data sheets shall prevail.
The product status of the product(s) described in the product data sheet may have changed since publication of the data sheet and therefore information in datasheets on product status may be outdated. The latest information on product status is published on the product information pages of the above-mentioned websites.
As from October 1st, 2006 Philips Semiconductors has a new trade name - NXP Semiconductors, which will be used in future data sheets together with new contact details. In data sheets where the previous Philips references remain, please use the new links as shown below.
- http://www.philips.semiconductors.com use http://www.nxp.com
- http://www.semiconductors.philips.com use http://www.nxp.com (Internet)
- sales.addresses@www.semiconductors.philips.com use salesaddresses@nxp.com (e-mail)
The copyright notice at the bottom of each page (or elsewhere in the document, depending on the version)
- © Koninklijke Philips Electronics N.V. (year). All rights reserved -
is replaced with:
- © NXP B.V. (year). All rights reserved.-
If you have any questions related to the data sheet, please contact our nearest sales office via e-mail or phone (details via salesaddresses@nxp.com). Thank you for your cooperation and understanding.