CY7C1021B
Document #: 38-05145 Rev. *C
Page 2 of 10
Pin Configurations
Selection Guide
-12
-15
Maximum Access Time (ns)
12
15
Maximum Operating Current (mA)
Com’l/Ind’l
140
130
Automotive
130
Maximum CMOS Standby Current (mA)
Com’l/Ind’l
10
10
Automotive
15
L Version
0.5
0.5
WE
1
2
3
4
5
6
7
8
9
10
11
14
31
32
36
35
34
33
37
40
39
38
Top View
SOJ/TSOP II
12
13
41
44
43
42
16
15
29
30
VCC
A15
A14
A13
A12
NC
A4
A3
OE
VSS
A5
I/O16
A2
CE
I/O3
I/O1
I/O2
BHE
NC
A1
A0
18
17
20
19
I/O4
27
28
25
26
22
21
23
24
NC
VSS
I/O7
I/O5
I/O6
I/O8
A6
A7
BLE
VCC
I/O15
I/O14
I/O13
I/O12
I/O11
I/O10
I/O9
A8
A9
A10
A11
Pin Definitions
Pin Name
SOJ, TSOP–Pin Number
I/O Type
Description
A0–A15
1–5,18–21, 24–27, 42–44
Input
Address Inputs used to select one of the address locations.
I/O1–I/O16
7–10, 13–16, 29–32,
35–38
Input/Output Bidirectional Data I/O lines. Used as input or output lines depending
on operation.
NC
22, 23, 28
No Connect
No Connects. Not connected to the die.
WE
17
Input/Control Write Enable Input, active LOW. When selected LOW, a Write is
conducted. When deselected HIGH, a Read is conducted.
CE
6
Input/Control Chip Enable Input, active LOW. When LOW, selects the chip. When
HIGH, deselects the chip.
BHE, BLE
40, 39
Input/Control Byte Write Select Inputs, active LOW. BHE controls I/O16–I/O9,
BLE controls I/O8–I/O1.
OE
41
Input/Control Output Enable, active LOW. Controls the direction of the I/O pins.
When LOW, the I/O pins are allowed to behave as outputs. When
deasserted HIGH, I/O pins are tri-stated, and act as input data pins.
VSS
12, 34
Ground
Ground for the device. Should be connected to ground of the
system.
VCC
11, 33
Power Supply Power Supply inputs to the device.
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