gvt71256b18 ETC-unknow, gvt71256b18 Datasheet - Page 3

• Manufacturer Part Number: gvt71256b18
• Description: 256k Synchronous Burst Sram
• Manufacturer: ETC-unknow

PIN DESCRIPTIONS
February 10, 1998
Rev. 2/98
37, 36, 35, 34, 33, 32,
100, 99, 82, 81, 80, 48,
47, 46, 45, 44, 49, 50
GALVANTECH
QFP PINS
93, 94
87
88
89
98
92
SYMBOL
A0-A17
WEL#,
WEH#
BWE#
CE2#
GW#
CLK
CE#
VCCQ
VCCQ
VCCQ
VCCQ
VSSQ
VSSQ
VSSQ
VSSQ
DQ11
DQ12
DQP2
DQ10
DQ13
DQ14
DQ15
DQ16
VCC
DQ9
VSS
Synchronous
Synchronous
Synchronous
Synchronous
Synchronous
Synchronous
Synchronous
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
TYPE
Input-
Input-
Input-
Input-
Input-
Input-
Input-
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
1
2
3
4
5
6
7
8
9
100 99
31
, INC.
32
Addresses: These inputs are registered and must meet the setup and hold
times around the rising edge of CLK. The burst counter generates internal
addresses associated with A0 and A1, during burst cycle and wait cycle.
Byte Write Enables: A byte write enable is LOW for a WRITE cycle and
HIGH for a READ cycle. WEL# controls DQ1-DQ8 and DQP1. WEH#
controls DQ9-DQ16 and DQP2. Data I/O are high impedance if either of
these inputs are LOW, conditioned by BWE# being LOW.
Write Enable: This active LOW input gates byte write operations and must
meet the setup and hold times around the rising edge of CLK.
Global Write: This active LOW input allows a full 18-bit WRITE to occur
independent of the BWE# and WEn# lines and must meet the setup and
hold times around the rising edge of CLK.
Clock: This signal registers the addresses, data, chip enables, write
control and burst control inputs on its rising edge. All synchronous inputs
must meet setup and hold times around the clock’s rising edge.
Chip Enable: This active LOW input is used to enable the device and to
gate ADSP#.
Chip Enable: This active LOW input is used to enable the device.
PIN ASSIGNMENT (Top View)
98
33
97
34
96
35
95
36
94
37
100-pin PQFP
100-pin TQFP
93
38
256K X 18 SYNCHRONOUS BURST SRAM
92
39
91
40
or
3
90
41
89
42
88
43
87
44
DESCRIPTION
86
45
85
46
84
47
83
48
82
49
81
50
Galvantech, Inc. reserves the right to change products or specifications without notice.
80
79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
A10
NC
NC
VCCQ
VSSQ
NC
DQP1
VCCQ
VSS
NC
VCC
ZZ
DQ4
DQ3
DQ1
VSSQ
VCCQ
NC
DQ8
DQ7
VSSQ
DQ6
DQ5
VCCQ
VSSQ
DQ2
NC
NC
NC
NC
GVT71256B18