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Add 28256/28C256/28HC256 #4

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100 changes: 100 additions & 0 deletions 28256.yaml
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---
description: "32K x 8 parallel EEPROM"
aliases: [28C256, 28HC256]
package: DIP
pincount: 28
family: "memory"
datasheet: "http://www.atmel.com/Images/doc0007.pdf"
pins:
- num: 1
sym: A__14
desc: address input
- num: 2
sym: A__12
desc: address input
- num: 3
sym: A__7
desc: address input
- num: 4
sym: A__6
desc: address input
- num: 5
sym: A__5
desc: address input
- num: 6
sym: A__4
desc: address input
- num: 7
sym: A__3
desc: address input
- num: 8
sym: A__2
desc: address input
- num: 9
sym: A__1
desc: address input
- num: 10
sym: A__0
desc: address input
- num: 11
sym: I/O__0
desc: data input/output
- num: 12
sym: I/O__1
desc: data input/output
- num: 13
sym: I/O__2
desc: data input/output
- num: 14
sym: GND
desc: ground
- num: 15
sym: I/O__3
desc: data input/output
- num: 16
sym: I/O__4
desc: data input/output
- num: 17
sym: I/O__5
desc: data input/output
- num: 18
sym: I/O__6
desc: data input/output
- num: 19
sym: I/O__7
desc: data input/output
- num: 20
sym: ~CE
desc: chip enable (active low)
- num: 21
sym: A__10
desc: address input
- num: 22
sym: ~OE
desc: output enable (active low)
- num: 23
sym: A__11
desc: address input
- num: 24
sym: A__9
desc: address input
- num: 25
sym: A__8
desc: address input
- num: 26
sym: A__13
desc: address input
- num: 27
sym: ~WE
desc: write enable (active low)
- num: 28
sym: Vcc
desc: supply voltage
notes:
- Data is written when ~CE is low and ~WE is low.
- Data is read when ~CE is low, ~OE is low, and ~WE is high.
- The input/output pins assume a high-impedance state if ~CE is high.
...