DS1743-100 Maxim Integrated Products, DS1743-100 Datasheet - Page 3

• Manufacturer Part Number: DS1743-100
• Description: Real Time Clock
• Manufacturer: Maxim Integrated Products

Specifications of DS1743-100

• Function: Clock, Calendar, NV Timekeeping RAM
• Rtc Memory Size: 8192 B
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 4.5 V
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Mounting Style: Through Hole
• Rtc Bus Interface: Parallel
• Package / Case: eDIP
• Time Format: HH:MM:SS
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ORDERING INFORMATION
+Denotes a lead(Pb)-free/RoHS-compliant package.
*DS9034PCX required (must be ordered separately).
**A ‘+’ indicates lead(Pb)-free. The top mark will include a ‘+’ symbol on lead(Pb)-free devices.
DESCRIPTION
The DS1743 is a full-function, year-2000-compliant (Y2KC), real-time clock/calendar (RTC) and 8k x 8
nonvolatile static RAM. User access to all registers within the DS1743 is accomplished with a bytewide
interface as shown in Figure 1. The RTC information and control bits reside in the eight uppermost RAM
locations. The RTC registers contain century, year, month, date, day, hours, minutes, and seconds data in
24-hour binary-coded decimal (BCD) format. Corrections for the day of the month and leap year are made
automatically. The RTC clock registers are double buffered to avoid access of incorrect data that can occur
during clock update cycles. The double-buffered system also prevents time loss as the timekeeping
countdown continues unabated by access to time register data. The DS1743 also contains its own power-
fail circuitry, which deselects the device when the V
V
high, preventing any access. When V
for the system to stabilize. These features prevent loss of data from unpredictable system operation brought
on by low V
DS1743-85
DS1743-100
DS1743-100 IND
DS1743P-85
DS1743P-100
DS1743P-100IND
DS1743W-120
DS1743W-120 IND
DS1743W-150
DS1743W-150 IND
DS1743WP-120
DS1743WP-120 IND
DS1743-85+
DS1743-100+
DS1743-100 IND+
DS1743P-85+
DS1743P-100+
DS1743P-100IND+
DS1743W-120+
DS1743W-120 IND+
DS1743W-150+
DS1743W-150 IND+
DS1743WP-120+
DS1743WP-120 IND+
DS9034PCX
DS9034I-PCX
DS9034PCX+
DS9034I-PCX+
CC
is above V
PART
CC
as errant access and update cycles are avoided.
PF
, the device is fully accessible. When V
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
CC
rises above V
PIN-PACKAGE
28 EDIP Module
28 EDIP Module
28 EDIP Module
34 PowerCap*
34 PowerCap*
34 PowerCap*
28 EDIP Module
28 EDIP Module
28 EDIP Module
28 EDIP Module
34 PowerCap*
34 PowerCap*
28 EDIP Module
28 EDIP Module
28 EDIP Module
34 PowerCap*
34 PowerCap*
34 PowerCap*
28 EDIP Module
28 EDIP Module
28 EDIP Module
28 EDIP Module
34 PowerCap*
34 PowerCap*
PowerCap
PowerCap IND
PowerCap
PowerCap IND
DS1743/DS1743P Y2K-Compliant, Nonvolatile Timekeeping RAMs
3 of 16
CC
PF
, access remains inhibited for T
supply is in an out-of-tolerance condition. When
CC
is below V
VOLTAGE
(V)
3.3
3.3
3.3
3.3
3.3
3.3
3.3
3.3
3.3
3.3
3.3
3.3
—
—
—
—
5
5
5
5
5
5
5
5
5
5
5
5
PF
, the internal CE signal is forced
DS1743-85
DS1743-100
DS1743-100-IND
DS1743P-85
DS1743P-100
DS1743P-100 IND
DS1743W-120
DS1743W-120 IND
DS1743W-150
DS1743W-150 IND
DS1743WP-120
DS1743WP-120 IND
DS1743-85
DS1743-100
DS1743-100-IND
DS1743P-85
DS1743P-100
DS1743P-100 IND
DS1743W-120
DS1743W-120 IND
DS1743W-150
DS1743W-150 IND
DS1743WP-120
DS1743WP-120 IND
DS9034PC
DS9034PCI
DS9034PC
DS9034PCI
TOP MARK**
REC
, allowing time