HC6856 Datasheet, PDF (10/12 Pages) Honeywell Solid State Electronics Center – 32K x 8 STATIC RAM

HC6856
PACKAGING
The 32K x 8 SRAM is offered in a custom 36-lead flat pack
(FP), 28-Lead FP, or standard 28-lead DIP. Each package
is constructed of multilayer ceramic (Al₂O₃) and features
internal power and ground planes. The 36-lead FP also
features a non-conductive ceramic tie bar on the lead
frame. The purpose of the tie bar is to allow electrical testing
of the device, while preserving the lead integrity during
shipping and handling, up to the point of lead forming and
insertion. Ceramic chip capacitors can be mounted to the
package by the user to maximize supply noise decoupling
and increase board packing density. These capacitors
attach directly to the internal package power and ground
planes. This design minimizes resistance and inductance
of the bond wire and package, both of which are critical in
a transient radiation environment. All NC (no connect) pins
must be connected to either VDD, VSS or an active driver
to prevent charge build up in the radiation environment.
28-LEAD DIP & FP PINOUT
36-LEAD FLAT PACK PINOUT
A14
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
VSS
1
28
2
27
3
26
4
25
5
24
6
23
7 ^Top 22
8 View 21
9
20
10
19
11
18
12
17
13
16
14
15
VDD
NWE
A13
A8
A9
A11
NOE
A10
NCS
DQ7
DQ6
DQ5
DQ4
DQ3
VSS
1
VDD
2
A14
3
A12
4
A7
5
A6
6
A5
7
A4
8
A3
9
A2
10
A1
11
A0
12
DQ0
13
DQ1
14
DQ2
15
NC
16
VDD
17
VSS
18
Top
View
36
VSS
35
VDD
34
NWE
33
CE
32
A13
31
A8
30
A9
29
A11
28
NOE
27
A10
26
NCS
25
DQ7
24
DQ6
23
DQ5
22
DQ4
21
DQ3
20
VDD
19
VSS
36-LEAD FLAT PACK (22017194-001)
E
1
Top
Side
H
J
L
Ceramic
Body
Optional
Standoff
A
L
Kovar
Lid [3]
I
C
X
Optional
N
VDD ^{VSS Capacitors VDD VSS}
Y
1
O
V
W
T
P
U
R
10
b
(width)
e
(pitch)
Non-
Conductive
Tie-Bar
0.004
M
All dimensions are in inches [1]
A 0.095 ± 0.010
M 0.008 ± 0.003
S
b 0.008 ± 0.002
N 0.050 ± 0.010
C 0.005 to 0.0075 O 0.090 ref
D 0.650 ± 0.010
P 0.015 ref
E 0.630 ± 0.007
R 0.075 ref
e 0.025 ± 0.002 [2] S 0.113 ± 0.010
F 0.425 ± 0.005 [2] T 0.050 ref
G 0.525 ± 0.005
U 0.030 ref
H 0.135 ± 0.005
V 0.080 ref
I 0.030 ± 0.005
W 0.005 ref
J 0.080 typ.
X 0.450 ref
L 0.285 ± 0.015
Y 0.400 ref
[1] Parts delivered with leads unformed
[2] At tie bar
[3] Lid tied to VSS