Dallas Semiconductor DS2229-85 Datasheet
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FEATURES
Organized as a high density 512k x 16 bit
Stik
TM
Fast access time of 85 ns
Unlimited write cycles
Employs popular JEDEC standard 80-position
SIMM connector
Full ±10% operating range
Read cycle time equals write cycle time
Ultra-low standby current < 10 µA
Suitable for battery-backed applications
PIN ASSIGNMENT
DESCRIPTION
The DS2229 is an 8,388,608-bit low-power fully static Random Access Memory organized as a 524,888
word by 16 bits using CMOS technology. The device employs the popular JEDEC standard 80-pin SIMM
connection scheme with no additional circuitry required. The device operates from a single power suppl y
with a voltage input of 4.5 to 5.5 volts. The Chip Enable inputs ( CE0 , CE1, CE2 , CE3) are used for
device selection and can be used in order to achieve the minimum standby current mode which facilitates
battery backup. The device provides a fast access time of 85 ns. The DS2229 maintains TTL levels over
input voltage range 4.5V to 5.5V. The DS2229 is JEDEC pin compatible (see Figure 1) with flash
EEPROM memory SIMM boards of similar density.
DS2229
Word-Wide 8 Meg SRAM Stik
www.dalsemi.com
801
1M
SRAM
1M
SRAM
1M
SRAM
1M
SRAM
80-PIN SIP STIK
DS2229
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PIN DESCRIPTION Figure 1
PIN # PIN NAME PIN # PIN NAME PIN # PIN NAME
1 GND 32 NC 63 DQ
7
2VCC33 NC 64 DQ
6
3NC34NC65DQ
5
4
OE
35 NC 66 DQ
4
5
WEH
36 A
16
67 DQ
3
6
WEL
37 A
15
68 DQ
2
7NC38A1469 DQ
1
8CS39A1370 DQ
0
9NC40A1271 NC
10 NC 41 A
11
72 V
CC
11 NC 42 A
10
73 NC
12 NC 43 A
9
74 GND
13 NC 44 A
8
75 NC
14 NC 45 A
7
76 GND
15 NC 46 A
6
77 GND
16 NC 47 A
5
78 NC
17 NC 48 A
4
79 NC
18 NC 49 A
3
80 GND
19 NC 50 A
2
20 NC 51 A
1
21
CE3
52 A
0
PIN NAME DESCRIPTION
22
CE2
53 GND A0 - A
16
Address Input
23
CE1
54 GND
WEL
Write Enable Input Low
24
CE0
55 DQ
15
WEH
Write Enable Input High
25 GND 56 DQ
14
OE
Output Enable Input
26 NC 57 DQ
13
NC No Connect
27 NC 58 DQ
12
CE0 - CE3
Chip Enable Input
28 NC 59 DQ
11
CS Chip Select
29 NC 60 DQ
10
DQ0 - DQ
15
Data Input/Output
30 NC 61 DQ
9
V
CC
+5 Volts
31 NC 62 DQ
8
GND Ground
DS2229
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DS2229 STATIC RAM MODULE FUNCTION DIAGRAM Figure 2
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