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X88257P Datasheet(PDF) 2 Page - Xicor Inc. |
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X88257P Datasheet(HTML) 2 Page - Xicor Inc. |
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2 / 15 page  X88257 2 PIN NAMES Symbol Description ALE Address Latch Enable A/D0–A/D7 Address Inputs/Data I/O A8–A14 Address Inputs RD Read Input WR Write Input PSEN Program Store Enable Input CE, CE Chip Enable VSS Ground VCC Supply Voltage NC No Connect 6509 PGM T01.1 PIN DESCRIPTIONS Address/Data (A/D0–A/D7) Multiplexed low-order addresses and data. The ad- dresses flow into the device while ALE is HIGH. After ALE transitions from a HIGH to LOW the addresses are latched. Once the addresses are latched these pins input data or output data depending on RD, WR, PSEN, and CE. Addresses (A8–A14) High order addresses flow into the device when ALE = VIH and are latched when ALE goes LOW. Chip Enable ( CE) The Chip Enable input must be LOW to enable all read/ write operations. When CE is HIGH, ALE is LOW, and CE is LOW, the X88257 is placed in the low power standby mode. If CE is used to select the device, the CE must be tied LOW. Chip Enable (CE) Chip enable is active HIGH. When CE is used to select the device, the CE must be tied HIGH. Program Store Enable ( PSEN) When the X88257 is to be used in a 8051-based system, PSEN is tied directly to the microcontroller’s PSEN output. Read ( RD) When the X88257 is to be used in a 8051-based system, RD is tied directly to the microcontroller’s RD output. Write ( WR) When the X88257 is to be used in a 8051-based system, WR is tied directly to the microcontroller’s WR output. Address Latch Enable (ALE) Addresses flow through the latches to address decoders when ALE is HIGH and are latched when ALE transitions from a HIGH to LOW. PIN CONFIGURATION 6509 FHD F01.3 A14 A12 ALE PSEN CE NC NC NC NC NC A/D0 A/D1 A/D2 VSS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 VCC WR A13 A8 A9 A11 RD A10 CE A/D7 A/D6 A/D5 A/D4 A/D3 PDIP SOIC X88257 6509 FHD F01A.5 PSEN CE NC NC NC NC NC NC A/D0 A8 A9 A11 NC RD A10 CE A/D7 A/D6 32 1 32 31 15 16 17 18 19 5 6 7 8 9 10 11 12 28 27 26 25 24 23 22 X88257 PLCC 4 13 14 20 21 29 30 |
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