Features
- True Dual-Ported memory cells which allow simultaneous access of the same memory location
- Two INT flags for port-to-port communications
- BUSY input
- Fully asynchronous operation from either port
- Battery backup operation – 2V data retention (LA only)
- TTL-compatible, single 5V ±10% power supply
- Available in 52-Pin PLCC, 64-Pin TQFP and STQFP packages
- Industrial temperature range (–40C to +85C) is available
71421 - Block Diagram
Description
The 71421 is a high-speed 2K x 8 Dual-Port Static RAM with internal interrupt logic for interprocessor communications. It is designed to be used as a "SLAVE" Dual-Port RAM together with the 71321 "MASTER" Dual-Port in 16-bit-or-more word width systems which would result in full-speed, error free operation without the need for additional discrete logic. An automatic power down feature, controlled by CE, permits the on chip circuitry of each port to enter a very low standby power mode.
Parameters
| Attributes | Value |
|---|---|
| Core Voltage (V) | 5 |
| Bus Width (bits) | 8 |
| Density (Kb) | 16 |
| Pkg. Code | PNG64 |
| Interface | Async |
| I/O Type | 5.0 V TTL |
| Access Time (ns) | 20, 25 |
| Temp. Range (°C) | -40 to 85°C, 0 to 70°C |
| Architecture | Dual-Port |
| Organization | 2K x 8 |
| Function | Busy, Interrupt, Slave |
Package Options
| Pkg. Type | Pkg. Dimensions (mm) | Lead Count (#) | Pitch (mm) |
|---|---|---|---|
| TQFP | 14.0 x 14.0 x 1.4 | 64 | 0.8 |
| Part Number | Status | Samples | Stock | Package | Budgetary Price (USD) | Lead Count (#) | Temp. Grade | Pb (Lead) Free | Carrier Type | Moisture Sensitivity Level (MSL) | Country of Assembly | Country of Wafer Fabrication |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 71421LA20PFG | Active | Available | In Stock | TQFP | 1ku | $19.75 | 64# | C | Yes | Tray | 3 | TAIWAN | TAIWAN, USA |
| 71421LA25PFGI | Active | Available | In Stock | TQFP | 1ku | $19.75 | 64# | I | Yes | Tray | 3 | TAIWAN | TAIWAN, USA |
| 71421LA25PFGI8 | Active | N/A | Out of Stock | TQFP | 1ku | $19.75 | 64# | I | Yes | Reel | 3 | TAIWAN | TAIWAN, USA |
| 71421LA20J | Obsolete | N/A | Out of Stock | PLCC | 52# | C | No | Tube | 3 | |||
| 71421LA20J8 | Obsolete | N/A | Out of Stock | PLCC | 52# | C | No | Reel | 3 | |||
| 71421LA20JG | Obsolete | N/A | Out of Stock | PLCC | 52# | C | Yes | Tube | 3 | |||
| 71421LA20JG8 | Obsolete | N/A | Out of Stock | PLCC | 52# | C | Yes | Reel | 3 | |||
| 71421LA20PF | Obsolete | N/A | Out of Stock | TQFP | 64# | C | No | Tray | 3 | |||
| 71421LA20PF8 | Obsolete | N/A | Out of Stock | TQFP | 64# | C | No | Reel | 3 | |||
| 71421LA20PFG8 | Obsolete | N/A | Out of Stock | TQFP | 64# | C | Yes | Reel | 3 | |||
| 71421LA25J | Obsolete | N/A | Out of Stock | PLCC | 52# | C | No | Tube | 3 | |||
| 71421LA25J8 | Obsolete | N/A | Out of Stock | PLCC | 52# | C | No | Reel | 3 | |||
| 71421LA25JI | Obsolete | N/A | Out of Stock | PLCC | 52# | I | No | Tube | 3 | |||
| 71421LA25JI8 | Obsolete | N/A | Out of Stock | PLCC | 52# | I | No | Reel | 3 | |||
| 71421LA25PF | Obsolete | N/A | Out of Stock | TQFP | 64# | C | No | Tray | 3 | |||
| 71421LA25PF8 | Obsolete | N/A | Out of Stock | TQFP | 64# | C | No | Reel | 3 | |||
| 71421LA25PFI | Obsolete | N/A | Out of Stock | TQFP | 64# | I | No | Tray | 3 | |||
| 71421LA25PFI8 | Obsolete | N/A | Out of Stock | TQFP | 64# | I | No | Reel | 3 | |||
| 71421LA35J | Obsolete | N/A | Out of Stock | PLCC | 52# | C | No | Tube | 3 | |||
| 71421LA35J8 | Obsolete | N/A | Out of Stock | PLCC | 52# | C | No | Reel | 3 | |||
| 71421LA35PF | Obsolete | N/A | Out of Stock | TQFP | 64# | C | No | Tray | 3 | |||
| 71421LA35PF8 | Obsolete | N/A | Out of Stock | TQFP | 64# | C | No | Reel | 3 | |||
| 71421LA55J | Obsolete | N/A | Out of Stock | PLCC | 52# | C | No | Tube | 3 | |||
| 71421LA55J8 | Obsolete | N/A | Out of Stock | PLCC | 52# | C | No | Reel | 3 | |||
| 71421LA55PF | Obsolete | N/A | Out of Stock | TQFP | 64# | C | No | Tray | 3 | |||
| 71421LA55PF8 | Obsolete | N/A | Out of Stock | TQFP | 64# | C | No | Reel | 3 | |||
| 71421SA20J | Obsolete | N/A | Out of Stock | PLCC | 52# | C | No | Tube | 3 | |||
| 71421SA20J8 | Obsolete | N/A | Out of Stock | PLCC | 52# | C | No | Reel | 3 | |||
| 71421SA20PF | Obsolete | N/A | Out of Stock | TQFP | 64# | C | No | Tray | 3 | |||
| 71421SA20PF8 | Obsolete | N/A | Out of Stock | TQFP | 64# | C | No | Reel | 3 | |||
| 71421SA25J | Obsolete | N/A | Out of Stock | PLCC | 52# | C | No | Tube | 3 | |||
| 71421SA25J8 | Obsolete | N/A | Out of Stock | PLCC | 52# | C | No | Reel | 3 | |||
| 71421SA25PF | Obsolete | N/A | Out of Stock | TQFP | 64# | C | No | Tray | 3 | |||
| 71421SA25PF8 | Obsolete | N/A | Out of Stock | TQFP | 64# | C | No | Reel | 3 | |||
| 71421SA35J | Obsolete | N/A | Out of Stock | PLCC | 52# | C | No | Tube | 3 | |||
| 71421SA35J8 | Obsolete | N/A | Out of Stock | PLCC | 52# | C | No | Reel | 3 | |||
| 71421SA35PF | Obsolete | N/A | Out of Stock | TQFP | 64# | C | No | Tray | 3 | |||
| 71421SA35PF8 | Obsolete | N/A | Out of Stock | TQFP | 64# | C | No | Reel | 3 | |||
| 71421SA55J | Obsolete | N/A | Out of Stock | PLCC | 52# | C | No | Tube | 3 | |||
| 71421SA55J8 | Obsolete | N/A | Out of Stock | PLCC | 52# | C | No | Reel | 3 | |||
| 71421SA55JI | Obsolete | N/A | Out of Stock | PLCC | 52# | I | No | Tube | 3 | |||
| 71421SA55JI8 | Obsolete | N/A | Out of Stock | PLCC | 52# | I | No | Reel | 3 | |||
| 71421SA55PF | Obsolete | N/A | Out of Stock | TQFP | 64# | C | No | Tray | 3 | |||
| 71421SA55PF8 | Obsolete | N/A | Out of Stock | TQFP | 64# | C | No | Reel | 3 |
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Hi Dialog, I have this scenario in which I want to turn on the device asynchoronously with the ble radio. The radio should remain off, however I should be able to send kernel messages and my tasks should be functioning along to work with other peripherals. Is this possible? How ...
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