DS1243Y Datasheet PDF - Dallas Semiconducotr
| Part Number | DS1243Y | |
| Description | 64K NV SRAM with Phantom Clock | |
| Manufacturers | Dallas Semiconducotr | |
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DS1243Y
64K NV SRAM with Phantom Clock
FEATURES
§ Real time clock keeps track of hundredths of
seconds, seconds, minutes, hours, days, date
of the month, months, and years
§ 8K x 8 NV SRAM directly replaces volatile
static RAM or EEPROM
§ Embedded lithium energy cell maintains
calendar operation and retains RAM data
§ Watch function is transparent to RAM
operation
§ Month and year determine the number of days
in each month; valid up to 2100
§ Lithium energy source is electrically
disconnected to retain freshness until power is
applied for the first time
§ Standard 28–pin JEDEC pinout
§ Full ±10% operating range
§ Operating temperature range 0°C to 70°C
§ Accuracy is better than ±1 minute/month @
25°C
§ Over 10 years of data retention in the absence
of power
§ Available in 120, 150 and 200 ns access time
ORDERING INFORMATION
DS1243Y–XXX
–120 120 ns access
–150 150 ns access
DS1243Y
200 ns access
PIN ASSIGNMENT
RST
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
1
2
3
4
5
6
7
8
9
10
11
12
28 VCC
27 WE
26 NC
25 A8
24 A9
23 A11
22 OE
21 A10
20 CE
19 DQ7
18 DQ6
17 DQ5
DQ2 13
16 DQ4
GND 14
15 DQ3
28-Pin Encapsulated Package
720-Mil Extended
PIN DESCRIPTION
A0–A12
– Address Inputs
CE
GND
DQ0–DQ7
VCC
– Chip Enable
– Ground
– Data In/Data Out
– Power (+5V)
WE – Write Enable
OE – Output Enable
NC – No Connect
RST – Reset
DESCRIPTION
The DS1243Y 64K NV SRAM with Phantom Clock is a fully static nonvolatile RAM (organized as 8192
words by 8 bits) with a built–in real time clock. The DS1243Y has a self–contained lithium energy source
and control circuitry which constantly monitors VCC for an out–of–tolerance condition. When such a
condition occurs, the lithium energy source is automatically switched on and write protection is
unconditionally enabled to prevent corrupted data in both the memory and real time clock.
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PHANTOM CLOCK REGISTER DEFINITION Figure 2
DS1243Y
AM–PM/12/24 MODE
Bit 7 of the hours register is defined as the 12– or 24–hour mode select bit. When high, the 12–hour mode
is selected. In the 12–hour mode, bit 5 is the AM/PM bit with logic high being PM. In the 24–hour mode,
bit 5 is the second 10–hour bit (20–23 hours).
OSCILLATOR AND RESET BITS
Bits 4 and 5 of the day register are used to control the RESET and oscillator functions. Bit 4 controls the
RESET (pin 1). When the RESET bit is set to logic 1, the RESET input pin is ignored. When the RESET
bit is set to logic 0, a low input on the RESET pin will cause the Phantom Clock to abort data transfer
without changing data in the watch registers. Bit 5 controls the oscillator. When set to logic 1, the
oscillator is off. When set to logic 0, the oscillator turns on and the watch becomes operational. These
bits are shipped from the factory set to a logic 1.
ZERO BITS
Registers 1, 2, 3, 4, 5, and 6 contain one or more bits which will always read logic 0. When writing these
locations, either a logic 1 or 0 is acceptable.
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| Information | Total 13 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ DS1243Y.PDF Datasheet ] | |
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