| Electronic component: | Description: | Manuf. | Package | Pins | T°min | T°max | Datasheet |
|---|
| HEF4505BDB | 64-bit, 1-bit per word random access read/write memory | Philips-Semiconductors | SOT73 | - | - | - | 96 K |
| HEF4505BP | 64-bit, 1-bit per word random access read/write memory | Philips-Semiconductors | SOT27 | - | - | - | 96 K |
| HEF4522BD | Programmable 4-bit BCD down counter | Philips-Semiconductors | DIL | 16 | - | - | 107 K |
| HEF4522BP | Programmable 4-bit BCD down counter | Philips-Semiconductors | DIL | 16 | - | - | 107 K |
| HEF4522BT | Programmable 4-bit BCD down counter | Philips-Semiconductors | SO | 16 | - | - | 107 K |
| HEF4531BD | 13-input parity checker/generator | Philips-Semiconductors | DIL | 16 | - | - | 36 K |
| HEF4531BD | 13-input parity checker/generator | Philips-Semiconductors | DIL | 16 | - | - | 36 K |
| HEF4531BP | 13-input parity checker/generator | Philips-Semiconductors | DIL | 16 | - | - | 36 K |
| HEF4534BP | Real time 5-decade counter | Philips-Semiconductors | DIL | 24 | - | - | 128 K |
| HEF4534BT | Real time 5-decade counter | Philips-Semiconductors | SO | 24 | - | - | 128 K |
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