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Part Number: HM534253B
Description: The HM534253B is a 1-Mbit multiport video RAM equipped with a 256-kword× 4-b...
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HM534253B
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DataSheet
General Description
HM534253B General Description
The HM534253B is a 1-Mbit multiport video RAM equipped with a 256-kword× 4-bit dynamic RAM and a 512-word× 4-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× 4-bit and the data of one row (512-word ×4-bit) respectively in one cycle of RAM. And the M534253B makes split transfer cycle possible by dividing SAM into two split buffers equipped with 256-word ×4-bit each. This cycle can transfer data to SAM which is not active, and enables a continuous serial access.
HM534253B Maximum Ratings
| Parameter |
Symbol |
Value |
Unit |
Note |
| Voltage on any pin relative to VSS |
VT |
1.0 to +7.0 |
V |
1 |
| Supply voltage relative to VSS |
VCC |
0.5 to +7.0 |
V |
1 |
| 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 |
HM534253B Features
` Multiport organizationAsynchronous and simultaneous operation of RAM and SAM capability
- RAM: 256-kword *4-bit
-SAM: 512-word * 4-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
- RAM: 256-kword *4-bit
-SAM: 512-word * 4-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
HM534253B Connection Diagram
HM534253B Series
PDF/DataSheet Download
- Datasheet: HM534253B Series
- File Size: 340646 KB
- Manufacturer: hitachi
- Click here to Download
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