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Part Number: HD74HC648
Description: Six control inputs enable this device to be used as a latched transceiver, unlatched transceiver or a combination of bo...
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HD74HC648
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DataSheet
General Description
HD74HC648 General Description
Six control inputs enable this device to be used as a latched transceiver, unlatched transceiver or a combination of both. As a latched transceiver, data from one bus is stored for later retrieval by the other bus. Alternately real time bus data (unlatched) may be directly transferred from one bus to another.
Circuit operation is determined by the Control G, Direction, Clock AB, Clock BA, Select AB, Select BA control inputs. The enable input, Contorl G, controls whether any bus outputs are enabled. The direction control Direction (DIR), determines which bus is enabled, and hence the direction data flows: The Select AB, Select BA inputs cotrol whether the latched data (stored in D type flip-flops), or the bus data (from other bus input pins) is transferred. Each set of flip-flops has its own clock Clock AB and Clock BA, for storing data. Data is latched on the rising edge of the clock.
HD74HC648 Maximum Ratings
| Item | Symbol | Rating | Unit |
| Supply voltage range | VCC | 0.5 to +7.0 | V |
| Input voltage | VIN | 0.5 to VCC + 0.5 | V |
| Output voltage | VOUT | 0.5 to VCC + 0.5 | V |
| Output current | IOUT | ±35 | mA |
| DC current drain per VCC, GND | ICC, IGND | ±75 | mA |
| DC input diode current | IIK | ±20 | mA |
| DC output diode current | IOK | ±20 | mA |
| Power dissipation per package | PT | 500 | mW |
| Storage temperautre | Tstg | 65 to +150 |
HD74HC648 Features
· High Speed Operation: tpd (Bus to Bus) = 14 ns typ (CL = 50 pF)
· High Output Current: Fanout of 15 LSTTL Loads
· Wide Operating Voltage: VCC = 2 to 6 V
· Low Input Current: 1 µA max
· Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)
· High Output Current: Fanout of 15 LSTTL Loads
· Wide Operating Voltage: VCC = 2 to 6 V
· Low Input Current: 1 µA max
· Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)
HD74HC648 Connection Diagram
HD71830
PDF/DataSheet Download
- Datasheet: HD71830
- File Size: 1260348 KB
- Manufacturer: Hitachi
- Click here to Download
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