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HM538123B

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 ...

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SeekIC No. : 004363468 Detail

HM538123B: 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...

HM538123B Data Sheet

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Part Number:
HM538123B
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



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


Pinout

Connection Diagram


Specifications

Parameter
Symbol
Value
Unit
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
°C
Storage temperature
Tstg
55 to +125
°C
Note: 1. Relative to VSS.


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.




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