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HM538253B

Features: · Multiport organization:RAM and SAM can operate asynchronously and simultaneously: -RAM: 256-kword ×8-bit -SAM: 512-word × 8-bit· Access time -RAM: 70 ns/80 ns/100 ns max -SAM: 20 ns/23 ns/25 ns max· Cycle time -RAM: 130 ns/150 ns/180 ns min -SAM: 25 ns/28 ns/30 ns min· Low power -Activ...

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SeekIC No. : 004363473 Detail

HM538253B: Features: · Multiport organization:RAM and SAM can operate asynchronously and simultaneously: -RAM: 256-kword ×8-bit -SAM: 512-word × 8-bit· Access time -RAM: 70 ns/80 ns/100 ns max -SAM: 20 ns/23 n...

HM538253B Data Sheet

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Part Number:
HM538253B
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:RAM and SAM can operate asynchronously and simultaneously:
     - RAM: 256-kword ×8-bit
     - SAM: 512-word × 8-bit
·  Access time
     - RAM: 70 ns/80 ns/100 ns max
     - SAM: 20 ns/23 ns/25 ns max
·  Cycle time
     - RAM: 130 ns/150 ns/180 ns min
     - SAM: 25 ns/28 ns/30 ns min
·  Low power
     - Active RAM: 605 mW/550 mW/495 mW
       SAM: 358 mW/330 mW/303 mW
     - Standby 38.5 mW max
·  Masked-write-transfer cycle capability
·  Stopping column feature capability
·  Persistent mask capability


Pinout

Connection Diagram


Specifications

Parameter
Symbol
Value
Unit
Voltage on any pin relative to VSS
VT
1.0 to +7.0
V
Supply voltage relative to VSS
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



Description

The HM538253B/HM538254B is a 2-Mbit multiport video RAM equipped with a 256-kword × 8-bit dynamic RAM and a 512-word × 8-bit SAM (full-sized SAM). Its RAM and SAM operate independently and asynchronously. The HM538253B/HM538254B is upwardly compatible with the HM534253B/HM538123B except that the pseudo-write-transfer cycle is replaced with masked-write-transfer cycle, which has been approved by JEDEC. Furthermore, several new features have been added to the HM538253B/HM538254B which do not conflict with the conventional features. The stopping column feature realizes allows greater flexibility for split SAM register lengths. Persistent mask is also installed according to the TMS34020 features. The HM538254B has Hyper page mode which enables fast page cycle.




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