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HM628128DLFP-5 Datasheet(PDF) 8 Page - Hitachi Semiconductor |
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HM628128DLFP-5 Datasheet(HTML) 8 Page - Hitachi Semiconductor |
8 / 20 page HM628128D Series 8 Write Cycle HM628128D -5 -7 Parameter Symbol Min Max Min Max Unit Notes Write cycle time t WC 55 — 70 — ns Address valid to end of write t AW 50 — 60 — ns Chip selection to end of write t CW 50 — 60 — ns 5 Write pulse width t WP 40 — 50 — ns 4, 13 Address setup time t AS 0— 0— ns 6 Write recovery time t WR 0— 0— ns 7 Data to write time overlap t DW 20 — 25 — ns Data hold from write time t DH 0— 0— ns Output active from output in high-Z t OW 5— 5— ns 2 Output disable to output in high-Z t OHZ 0 20 0 25 ns 1, 2, 8 WE to output in high-Z t WHZ 0 20 0 25 ns 1, 2, 8 Notes: 1. t CHZ, tOHZ and t WHZ are defined as the time at which the outputs achieve the open circuit conditions and are not referred to output voltage levels. 2. This parameter is sampled and not 100% tested. 3. At any given temperature and voltage condition, t HZ max is less than tLZ min both for a given device and from device to device. 4. A write occurs during the overlap (t WP) of a low CS1, a high CS2, and a low WE. A write begins at the later transition of CS1 going low, CS2 going high, or WE going low. A write ends at the earlier transition of CS1 going high, CS2 going low, or WE going high. t WP is measured from the beginning of write to the end of write. 5. t CW is measured from CS1 going low or CS2 going high to the end of write. 6. t AS is measured from the address valid to the beginning of write. 7. t WR is measured from the earlier of WE or CS1 going high or CS2 going low to the end of write cycle. 8. During this period, I/O pins are in the output state; therefore, the input signals of the opposite phase to the outputs must not be applied. 9. If the CS1 goes low or CS2 going high simultaneously with WE going low or after WE going low, the output remain in a high impedance state. 10. Dout is the same phase of the write data of this write cycle. 11. Dout is the read data of next address. 12. If CS1 is low and CS2 high during this period, I/O pins are in the output state. Therefore, the input signals of the opposite phase to the outputs must not be applied to them. 13. In the write cycle with OE low fixed, t WP must satisfy the following equation to avoid a problem of data bus contention. t WP ≥ tDW min + tWHZ max |
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