DS1610
Partitioned NV Controller
www.dalsemi.com
FEATURES
Converts CMOS RAMs into nonvolatile
memories
SOIC version is pin-compatible with the
Dallas Semiconductor DS1210 NV Controller
Unconditionally write protects all of memory
when V
CC
is out of tolerance
Write protects selected blocks of memory
regardless of V
CC
status when programmed
Automatically switches to battery backup
supply when power-fail occurs
Provides for multiple batteries
Consumes less than 100 nA of battery current
Test battery on power-up by inhibiting the
second memory cycle
Optional 5% or 10% power-fail detection
16-pin DIP or 16-pin SOIC surface-mount
package
Low forward voltage drop on the V
CC
switch
with currents of up to 150 mA
Optional industrial temperature range of
-40擄C to +85擄C
PIN ASSIGNMENT
A
W
V
CCO
A
X
V
BAT1
A
Y
TOL
DIS
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
PFO
V
CCI
A
Z
V
BAT2
WEO
CEO
WEI
CEI
16-Pin DIP and 16-Pin SOIC
PIN DESCRIPTION
V
CCI
V
BAT1
V
BAT2
V
CCO
GND
CEI
CEO
WEI
WEO
TOL
A
W
- A
Z
DIS
PFO
- Input +5 Volt Supply
- + Battery 1 Input
- + Battery 2 Input
- RAM Power (V
CC
) Supply
- Ground
- Chip Enable Input
- Chip Enable Output
- Write Enable Input
- Write Enable Output
- Power Supply Tolerance Select
- Address Inputs
- Memory Partition Disable
- Power-Fail Output
DESCRIPTION
The DS1610 is a low-power CMOS circuit which solves the application problems of converting CMOS
RAMS into nonvolatile memories. In addition the device has the ability to unconditionally write protect
blocks of memory so that inadvertent write cycles do not corrupt program and special data space. The
power supply incoming voltage at the V
CCI
input pin is constantly monitored for an out-of-tolerance
condition. When such a condition is detected, both the chip enable and write enable outputs are inhibited
to protect stored data. The battery inputs are used to supply V
CCO
with power when V
CCI
is less than the
battery input voltages. Special circuitry uses a low leakage CMOS process which affords precise voltage
detection at extremely low current consumption. By combining the DS1610 Partitioned NV Controller
chip with a CMOS memory and batteries, nonvolatile RAM operation can be achieved.
The DS1610 Partitioned NV Controller functions like the Dallas Semiconductor DS1210 NV controller
when the (
DIS
) disable pin is grounded. An internal pulldown resistor to ground on the
DIS
pin of the
DS1610S allows it to retrofit into DS1210S applications. When the
DIS
pin is grounded the address
inputs A
W
- A
Z
and the write enable input
WEI
are ignored. Also the power-fail output
PFO
and the write
enable output
WEO
are tristated.
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