M48T39YPM [STMICROELECTRONICS]
256 Kb 32K x8 TIMEKEEPER SRAM; 256 KB 32K ×8 TIMEKEEPER SRAM
| 型号： | M48T39YPM |
| 厂家： | 
ST |
| 描述： | 256 Kb 32K x8 TIMEKEEPER SRAM |
| 文件： | 总4页 (文件大小：33K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
M48T39Y
®
256 Kb (32K x8) TIMEKEEPER SRAM
PRELIMINARY DATA
■ INTEGRATED ULTRA LOW POWER SRAM,
REAL TIME CLOCK, POWER-FAIL CONTROL
CIRCUIT, BATTERY and CRYSTAL
■ BCD CODED YEAR, MONTH, DAY, DATE,
HOURS, MINUTES and SECONDS
■ AUTOMATIC POWER-FAIL CHIP DESELECT
and WRITE PROTECTION
■ WRITE PROTECT VOLTAGE
32
(V
PFD
= Power-fail Deselect Voltage):
1
– M48T39Y: 4.20V ≤ V
≤ 4.50V
PFD
■ PROGRAMMABLE INTERRUPTS and
SQUARE WAVE OUTPUT
PMDIP32 (PM)
Module
■ WATCHDOG TIMER RESTARTS on
OUT-OF-CONTROL PROCESSOR
■ CLOCK ACCURACY IS BETTER THAN
Figure 1. Logic Diagram
±1 MINUTE per MONTH at 25°C
■ 10 YEARS of DATA RETENTION and CLOCK
OPERATION in the ABSENCE of POWER
■ SELF-CONTAINED BATTERY and CRYSTAL
in DIP PACKAGE
V
CC
■ PROGRAMMABLE ALARM OUTPUT ACTIVE
in the BATTERY BACK-UP MODE
15
8
■ PIN and FUNCTION COMPATIBLE with
A0-A14
W
DQ0-DQ7
INTA
DS1386
DESCRIPTION
The M48T39Y TIMEKEEPER RAM is a non-vol-
M48Z129Y
®
atile 262,144 bit static RAM and real time clock or-
ganized as 32,768 words by 8 bits. System
integration features include Programmable
Alarms, Watchdog Timer and Interval Timer. The
special 32-pin DIP package provides a highly inte-
grated battery back-up memory and real time
clock solution.
E
INTB
SQW
G
V
SS
AI02311
January 1998
1/4
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
M48T39Y
Figure 2. DIP Connections
Table 1. Signal Names
A0-A14
DQ0-DQ7
E
Address Inputs
INTA
INTB
A14
A12
A7
1
2
3
4
5
6
7
8
9
32
V
Data Inputs / Outputs
Chip Enable Input
CC
31 SQW
30
29
V
CC
W
G
Output Enable Input
Write Enable Input
28 A13
27 A8
26 A9
25 A11
A6
W
A5
INTA
INTB
SQW
Interrupt Output A (Open Drain)
Interrupt Output B (Open Drain)
Square Wave Output
Supply Voltage
A4
M48T39Y
A3
24
23 A10
22
G
A2 10
A1 11
E
A0 12
21 DQ7
20 DQ6
19 DQ5
18 DQ4
17 DQ3
V
CC
DQ0 13
DQ1 14
DQ2 15
V
SS
Ground
V
16
SS
AI02312
Table 2. Ordering Information Scheme
Example:
M48T39Y
-100 PM
1
Device Type
M48T
Supply Voltage and Write Protect Voltage
39Y = V = 4.5V to 5.5V; V
= 4.2V to 4.5V
CC
PFD
Speed
-100 = 100ns
-150 = 150ns
Package
PM = PMDIP32
Temperature Range
1 = 0 to 70 °C
For a list of available options (Speed, Package, etc...) or for further information on any aspect of this de-
vice, please contact the ST Sales Office nearest to you.
2/4
M48T39Y
Table 3. PMDIP32 - 32 pin Plastic Module DIP, Package Mechanical Data
mm
inches
Min
Symb
Typ
Min
9.27
Max
9.52
–
Typ
Max
A
A1
B
0.3650
0.0150
0.0169
0.0079
1.6701
0.7098
0.0902
1.3500
0.5902
0.1201
0.0752
0.3748
–
0.38
0.43
0.59
0.33
43.18
18.80
2.79
41.91
16.00
3.81
2.79
0.0232
0.0130
1.7000
0.7402
0.1098
1.6500
0.6299
0.1500
0.1098
C
0.20
D
42.42
18.03
2.29
E
e1
e3
eA
L
34.29
14.99
3.05
S
1.91
N
32
32
Figure 3. PMDIP32 - 32 pin Plastic Module DIP, Package Outline
A
A1
e1
L
C
eA
S
B
e3
D
N
1
E
PMDIP
Drawing is not to scale.
3/4
M48T39Y
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences
of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted
by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject
to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not
authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
The ST logo is registered trademark of STMicroelectronics
1998 STMicroelectronics - All Rights Reserved
All other names are the property of their respective owners.
STMicroelectronics GROUP OF COMPANIES
Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco -
Singapore - Spain - Sweden - Switzerland - United Kingdom - U.S.A.
http://www.st.com
4/4
相关型号：
©2020 ICPDF网 联系我们和版权申明