DS1554P Maxim Integrated Products, DS1554P Datasheet

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DS1554P

Manufacturer Part Number
DS1554P
Description
256K NV Y2KC Real Time Clocks RAM
Manufacturer
Maxim Integrated Products
Datasheet

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Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
DS1554P+70
Quantity:
11
Part Number:
DS1554P-70+
Manufacturer:
Maxim Integrated Products
Quantity:
135
FEATURES
www.dalsemi.com
Integrated NV SRAM, real time clock,
crystal, power-fail control circuit and lithium
energy source
Clock registers are accessed identically to the
static RAM; these registers are resident in the
16 top RAM locations
Century byte register; i.e., Y2K complaint
Totally nonvolatile with over 10 years of
operation in the absence of power
Precision power-on reset
Programmable watchdog timer and RTC
alarm
BCD coded year, month, date, day, hours,
minutes, and seconds with automatic leap
year compensation valid up to the year 2100
Battery voltage level indicator flag
Power-fail write protection allows for 10%
V
Lithium
disconnected to retain freshness until power is
applied for the first time
CC
power supply tolerance
energy
source
is
electrically
256K NV Y2KC Timekeeping RAM
1 of 20
IRQ/FT
GND
DQ7
DQ6
DQ5
DQ4
DQ3
DQ2
DQ1
DQ0
RST
V
WE
NC
NC
OE
CE
CC
34-Pin PowerCap
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
DQ0
DQ1
DQ2
(Uses DS9034PCX PowerCap)
A14
A12
32-Pin Encapsulated Package
RST
NC
A7
A6
A5
A4
A3
A2
A1
A0
PIN ASSIGNMENT
X1 GND V
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
®
BAT
Module Board
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
X2
V
NC
IRQ/FT
WE
A13
A8
A9
A11
OE
A10
CE
DQ7
DQ6
DQ5
DQ4
DQ3
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
DS1554
CC
NC
NC
A14
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
022101

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DS1554P Summary of contents

Page 1

FEATURES Integrated NV SRAM, real time clock, crystal, power-fail control circuit and lithium energy source Clock registers are accessed identically to the static RAM; these registers are resident in the 16 top RAM locations Century byte register; i.e., Y2K ...

Page 2

... ORDERING INFORMATION DS1554 5V; 32-pin DIP Module DS1554P 5V; 34-pin PowerCap Module board* DS1554W 3.3V; 32-pin DIP Module DS1554WP 3.3V; 34-pin PowerCap Module board* *DS9034PCX (PowerCap) Required: must be ordered separately PIN DESCRIPTION A0-A14 - Address Input DQ0-DQ7 - Data Input/Outputs \FT - Interrupt, Frequency Test Output IRQ (Open Drain) ...

Page 3

... This design allows the PowerCap to be mounted on top of the DS1554P after the completion of the surface mount process. Mounting the PowerCap after the surface mount process prevents damage to the crystal and battery due to the high temperatures required for solder reflow ...

Page 4

DATA READ MODE The DS1554 is in the read mode whenever device architecture allows ripple-through access to any valid address location. Valid data will be available at the DQ pins within t after the last address input is stable, providing ...

Page 5

BATTERY LONGEVITY The DS1554 has a lithium power source that is designed to provide energy for the clock activity, and clock and RAM data retention when the V supply is sufficient to power the DS1554 continuously for the life of ...

Page 6

DS1554 REGISTER MAP Table 2 ADDRESS 7FFFh 10 Year 7FFEh X X 7FFDh X X 7FFCh X FT 7FFBh X X 7FFAh X 10 MINUTES 7FF9h 10 SECONDS OSC 7FF8h W R 7FF7h WDS BMB4 BMB3 ...

Page 7

SETTING THE CLOCK The 8th bit the Control Register is the write bit. Setting the write bit like the read bit, halts updates to the DS1554 (7FF8h-7FFFh) registers. After setting the write bit to a ...

Page 8

ALARM MASK BITS Table 3 AM4 AM3 AM2 When the RTC Register values match Alarm Register settings, the Alarm Flag bit (AF) is set to ...

Page 9

The /FT pin can also be activated in the battery backed mode. The IRQ occurs and both ABE and AE are set. The ABE and AE bits are cleared during the power-up transition, however an alarm generated during power-up will ...

Page 10

ABSOLUTE MAXIMUM RATINGS* Voltage on Any Pin Relative to Ground Storage Temperature Soldering Temperature * This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections ...

Page 11

DC ELECTRICAL CHARACTERISTICS PARAMETER Active Supply Current TTL Standby Current ( = V CE CMOS Standby Current = 0.2V Input Leakage Current (any input) Output Leakage Current (any output) Output Logic 1 Voltage (I = -1.0 ...

Page 12

READ CYCLE, AC CHARACTERISTICS PARAMETER Read Cycle Time Address Access Time to DQ Low-Z CE Access Time CE Data Off time Low-Z OE Access Time OE Data Off Time OE Output Hold from Address WRITE CYCLE, AC ...

Page 13

WRITE CYCLE TIMING, WRITE ENABLE CONTROLLED Figure 6 WRITE CYCLE TIMING, CHIP ENABLE CONTROLLED Figure DS1554 ...

Page 14

POWER-UP/DOWN CHARACTERISTICS PARAMETER Before Power-Down V Fall Time PF(MAX) V PF(MIN) V Fall Time PF(MIN Rise Time PF(MIN) V PF(MAX) V ...

Page 15

POWER-UP/DOWN CHARACTERISTICS PARAMETER Before Power-Down V Fall Time PF(MAX) V PF(MIN) V Rise Time PF(MIN) V PF(MAX High RST PF Expected Data Retention Time (Oscillator ...

Page 16

AC TEST CONDITIONS Output Load: 100 pF + 1TTL Gate Input Pulse Levels: 0.0 to 3.0V Timing Measurement Reference Levels: Input: 1.5V Output: 1.5V Input Pulse Rise and Fall Times NOTES: 1. Voltage referenced to ground. 2. Typical ...

Page 17

DS1554 32-PIN PACKAGE PKG 32-PIN DIM MIN MAX 1.670 1.690 A IN. MM 38.42 38.93 B IN. 0.715 0.740 18.16 18.80 MM 0.335 0.365 C IN. MM 8.51 9.27 D IN. 0.075 0.105 MM 1.91 0.67 E IN. 0.015 0.030 ...

Page 18

... DS1554P NOTE: Dallas Semiconductor recommends that PowerCap Module bases experience one pass through solder reflow oriented with the label side up (“live-bug”). Hand Soldering and touch-up: Do not touch or apply the soldering iron to leads for more than 3 seconds. To solder, apply flux to the pad, heat the lead frame pad and apply solder. To remove the part, apply flux, heat the lead frame pad until the solder reflows and use a solder wick to remove solder ...

Page 19

... DS1554P WITH DS9034PCX ATTACHED PKG INCHES DIM MIN NOM 0.920 0.925 A 0.955 0.960 B 0.240 0.245 C 0.052 0.055 D E 0.048 0.050 F 0.015 0.020 G 0.020 0.025 DS1554 MAX 0.930 0.965 0.250 0.058 0.052 0.025 0.030 ...

Page 20

RECOMMENDED POWERCAP MODULE LAND PATTERN PKG INCHES DIM MIN DS1554 NOM MAX 1.050 - 0.826 - 0.050 - 0.030 - 0.112 - ...

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