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74AHC259; 74AHCT259
General description
The 74AHC259; 74AHCT259 is a high-speed Si-gate CMOS device and is pin compatible with Low-power Schottky TTL (LSTTL). It is specified in compliance with JEDEC standard No. 7-A.
The 74AHC259; 74AHCT259 is a high-speed 8-bit addressable latch designed for general purpose storage applications in digital systems. It is a multifunctional device capable of storing single-line data in eight addressable latches and providing a 3-to-8 decoder and multiplexer function with active HIGH outputs (Q0 to Q7). It also incorporates an active LOW common reset (MR) for resetting all latches as well as an active LOW enable input (LE).
The 74AHC259; 74AHCT259 has four modes of operation:
- In the addressable latch mode, data on the data line (D) is written into the addressed latch. The addressed latch will follow the data input with all non-addressed latches remaining in their previous states.
- In the memory mode, all latches remain in their previous states and are unaffected by the data or address inputs.
- In the 3-to-8 decoding or demultiplexing mode, the addressed output follows the state of the data input (D) with all other outputs in the LOW state.
- In the reset mode, all outputs are LOW and unaffected by the address inputs (A0 to A2) and data input (D).
When operating the 74AHC259; 74AHCT259 as an address latch, changing more than one bit of the address could impose a transient-wrong address. Therefore, this should only be done while in the memory mode.
Features
- Balanced propagation delays
- All inputs have Schmitt-trigger actions
- Combines demultiplexer and 8-bit latch
- Serial-to-parallel capability
- Output from each storage bit available
- Random (addressable) data entry
- Easily expandable
- Common reset input
- Useful as a 3-to-8 active HIGH decoder
- Inputs accept voltages higher than VCC
- Input levels:
- For 74AHC259: CMOS level
- For 74AHCT259: TTL level
- ESD protection:
- HBM EIA/JESD22-A114E exceeds 2000 V
- MM EIA/JESD22-A115-A exceeds 200 V
- CDM EIA/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 |
|---|---|---|---|---|---|---|---|---|
| 74AHC259D | 74AHC259D | 9352 654 73112 | Volume production | SOT109-1
(SO16) | Tube | Standard Marking | 74AHC259D
| week 35, 2004 |
| 74AHC259D | 74AHC259D-T | 9352 654 73118 | Volume production | SOT109-1
(SO16) | Reel Pack, SMD, 13" | Standard Marking | 74AHC259D
| week 35, 2004 |
| 74AHC259PW | 74AHC259PW | 9352 654 74112 | Volume production | SOT403-1
(TSSOP16) | Tube | Standard Marking | 74AHC259PW
| week 7, 2005 |
| 74AHC259PW | 74AHC259PW-T | 9352 654 74118 | Volume production | SOT403-1
(TSSOP16) | Reel Pack, SMD, 13" | Standard Marking | 74AHC259PW
| week 7, 2005 |
| 74AHCT259D | 74AHCT259D | 9352 654 71112 | Volume production | SOT109-1
(SO16) | Tube | Standard Marking | 74AHCT259D
| week 35, 2004 |
| 74AHCT259D | 74AHCT259D-T | 9352 654 71118 | Volume production | SOT109-1
(SO16) | Reel Pack, SMD, 13" | Standard Marking | 74AHCT259D
| week 35, 2004 |
| 74AHCT259PW | 74AHCT259PW | 9352 654 72112 | Volume production | SOT403-1
(TSSOP16) | Tube | Standard Marking | 74AHCT259PW
| week 10, 2005 |
| 74AHCT259PW | 74AHCT259PW-T | 9352 654 72118 | Volume production | SOT403-1
(TSSOP16) | Reel Pack, SMD, 13" | Standard Marking | 74AHCT259PW
| week 10, 2005 |
Pricing/ordering/availability
| Type number | Ordering code(12NC) | Indicative price/unit($) | Region | Distributor | In stock | Inventory date | Buy online | Samples |
|---|---|---|---|---|---|---|---|---|
| 74AHC259D | 9352 654 73112 | 0.4500 | NA | AVNET ELECTRONICS MARKETING | 2,000 | 11/21/2008 | Buy online | not available |
| NA | DIGI-KEY CORPORATION | 1,860 | 11/21/2008 | Buy online | ||||
| 74AHC259D | 9352 654 73118 | 0.4500 | NA | MOUSER ELECTRONICS | 2,436 | 11/21/2008 | Buy online | Order samples |
| 74AHC259PW | 9352 654 74112 | 0.4500 | NA | AVNET ELECTRONICS MARKETING | 2,400 | 11/21/2008 | Buy online | not available |
| NA | DIGI-KEY CORPORATION | 1,064 | 11/21/2008 | Buy online | ||||
| 74AHC259PW | 9352 654 74118 | 0.4500 | NA | AVNET ELECTRONICS MARKETING | 7,500 | 11/21/2008 | Buy online | Order samples |
| 74AHCT259D | 9352 654 71112 | 0.4500 | NA | AVNET ELECTRONICS MARKETING | 1,000 | 11/21/2008 | Buy online | not available |
| NA | DIGI-KEY CORPORATION | 1,836 | 11/21/2008 | Buy online | ||||
| 74AHCT259D | 9352 654 71118 | 0.4500 | Order samples | |||||
| 74AHCT259PW | 9352 654 72112 | 0.4500 | NA | AVNET ELECTRONICS MARKETING | 2,400 | 11/21/2008 | Buy online | not available |
| NA | DIGI-KEY CORPORATION | 1,765 | 11/21/2008 | Buy online | ||||
| 74AHCT259PW | 9352 654 72118 | 0.4500 | Order samples |
Applications
Related applications
50-60 Hz CRT integrated DTV (TV210D)
Mid-range integrated DTV (TV810)
Parametrics/similar products
| Type number | Package | Description | Propagation Delay(ns) | Voltage | No. of Pins | Power Dissipation Considerations | Logic Switching Levels | Output Drive Capability |
|---|---|---|---|---|---|---|---|---|
| 74AHC259D | SOT109-1
(SO16) | 8 bit addressable latch | 4.1@5V | 2.0-5.5 V | 16 | Low Power or Battery Applications | CMOS | +/- 8 mA |
| 74AHC259PW | SOT403-1
(TSSOP16) | 8 bit addressable latch | 4.1@5V | 2.0-5.5 V | 16 | Low Power or Battery Applications | CMOS | +/- 8 mA |
| 74AHCT259D | SOT109-1
(SO16) | 8-Bit Addressable Latch; TTL Enabled | 4.1 | 4.5-5.5 V | 16 | Low Power | TTL | +/- 8 mA |
| 74AHCT259PW | SOT403-1
(TSSOP16) | 8-Bit Addressable Latch; TTL Enabled | 4.1 | 4.5-5.5 V | 16 | Low Power | TTL | +/- 8 mA |
Similar products
74AHC259; 74AHCT259 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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