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Part Number: HM538123BJ-8

 

MFG: HIT

Package Cooled: 96

 

Description: The HM538123B is a 1-Mbit multiport video RAM equipped with a 128-kword × 8-bit dynamic RAM and a 256-...


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HM538123BJ-8 General Description


The HM538123B is a 1-Mbit multiport video RAM equipped with a 128-kword × 8-bit dynamic RAM and a 256-word × 8-bit SAM (serial access memory). Its RAM and SAM operate independently and asynchronously. It can transfer data between RAM and SAM. In addition, it has two modes to realize fast writing in RAM. Block write and flash write modes clear the data of 4-word × 8-bit and the data of one row (256-word × 8-bit) respectively in one cycle of RAM. And the HM538123B makes split transfer cycle possible by dividing SAM into two split buffers equipped with 128-word × 8-bit each. This cycle can transfer data to SAM which is not active, and enables a continuous serial access.

HM538123BJ-8 Maximum Ratings

Terminal voltage *1 VT ..................1.0 to +7.0 V
Power supply voltage *1 VCC........ 0.5 to +7.0 V
Short circuit output current Iout ...................50 mA
Power dissipation PT ....................................1.0 W
Operating temperature Topr .................0 to +70
Storage temperature Tstg ..............55 to +125
Note: 1. Relative to VSS.

HM538123BJ-8 Features

`  Multiport organization Asynchronous and simultaneous operation of RAM and SAM capability
- RAM: 128-kword *8-bit and
- SAM: 256-word * 8-bit
`  Access time
- RAM: 60 ns/70 ns/80 ns/100 ns max
- SAM: 20 ns/22 ns/25 ns/25 ns max
`  Cycle time
- RAM: 125 ns/135 ns/150 ns/180 ns min
- SAM: 25 ns/25 ns/30 ns/30 ns min
`  Low power
- Active RAM: 413 mW max
SAM: 275 mW max
- Standby 38.5 mW max
`  High-speed page mode capability
`  Mask write mode capability
`  Bidirectional data transfer cycle between RAM and SAM capability
`  Split transfer cycle capability
`  Block write mode capability
`  Flash write mode capability
`  3 variations of refresh (8 ms/512 cycles)
-  RAS-only refresh
-  CAS-before-RAS refresh
-  Hidden refresh
`  TTL compatible

HM538123BJ-8 Connection Diagram

HM538123BJ-8 Connection Diagram

HM538123BJ-8 datasheet

HM50-3R9MLF
PDF/DataSheet Download

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