Datasheet

ManualsBrandsSTMICROELECTRONICS ManualsClock & Timing ICsSOIC 28

November 2008 Rev 3 1/16

M4T28-BR12SH

M4T32-BR12SH

TIMEKEEPER

SNAPHAT

(battery and crystal)

Features

■ Provides battery backup power for non-volatile

TIMEKEEPER

and supervisor devices in the

28- or 44-pin SNAPHAT

SOIC package

■ Removable battery avoids heat associated with

surface mount process

■ Snaps directly onto surface-mounted

SNAPHAT SOIC

■ Choice of battery capacities:

– M4T28-BR12SH = 48 mAh

– M4T32-BR12SH = 120 mAh

■ Keyed insertion to ensure proper assembly

■ Removable for replacement and proper

disposal

■ Pb-free package

■ Available in Ecopack

packages, tubes or tape

& reel

SNAPHAT (SH)

battery/crystal

www.st.com

Summary of content (16 pages)

PAGE 1
M4T28-BR12SH M4T32-BR12SH TIMEKEEPER® SNAPHAT® (battery and crystal) Features ■ Provides battery backup power for non-volatile TIMEKEEPER® and supervisor devices in the 28- or 44-pin SNAPHAT® SOIC package ■ Removable battery avoids heat associated with surface mount process ■ Snaps directly onto surface-mounted SNAPHAT SOIC ■ Choice of battery capacities: – M4T28-BR12SH = 48 mAh – M4T32-BR12SH = 120 mAh ■ Keyed insertion to ensure proper assembly ■ Removable for replacement and proper disposal ■
PAGE 2
Contents M4T28-BR12SH, M4T32-BR12SH Contents 1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3 DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4 Mechanical information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 4.1 Battery characteristics .
PAGE 3
M4T28-BR12SH, M4T32-BR12SH List of tables List of tables Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Operating and AC measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PAGE 4
List of figures M4T28-BR12SH, M4T32-BR12SH List of figures Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. 4/16 Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 SNAPHAT® insertion/extraction forces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Battery discharge rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PAGE 5
M4T28-BR12SH, M4T32-BR12SH 1 Description Description The M4TXX-BR12SH SNAPHAT® top is a detachable lithium power source for ST’s nonvolatile TIMEKEEPER® surface-mount SOIC (MH) package (28- and 44-pin). The SNAPHAT top contains both the battery and crystal and is designed to be “snapped on” after the SOIC is surface mounted on the PC board. Thus the two piece solution prevents the battery and crystal from being exposed to the high temperatures of the surface mount process. Figure 1.
PAGE 6
Maximum ratings 2 M4T28-BR12SH, M4T32-BR12SH Maximum ratings Stressing the device above the rating listed in the absolute maximum ratings table may cause permanent damage to the device. These are stress ratings only and operation of the device at these or any other conditions above those indicated in the operating sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
PAGE 7
M4T28-BR12SH, M4T32-BR12SH 3 DC and AC parameters DC and AC parameters This section summarizes the operating and measurement conditions, as well as the DC and AC characteristics of the device. The parameters in the following DC and AC characteristic tables are derived from tests performed under the measurement conditions listed in the relevant tables. Designers should check that the operating conditions in their projects match the measurement conditions when using the quoted parameters. Table 3.
PAGE 8
Mechanical information 4 M4T28-BR12SH, M4T32-BR12SH Mechanical information Electrical connection to the SOIC is made through four pins that connect to the four press fitted sockets at each end of the SOIC. Critical contact points between the pins and sockets are gold-plated to resist oxidation. Internally, each socket contains six independent contact fingers to form redundant connections between the two components.
PAGE 9
M4T28-BR12SH, M4T32-BR12SH 4.1 Mechanical information Battery characteristics Figure 3 on page 10 illustrates the lithium coin cell discharge rate for a given load. This demonstrates the characteristically flat voltage level supplied by the battery until very near the end of its life. These discharge levels have been greatly accelerated in comparison to the normal, actual usage. Note: These batteries contain no mercury (Hg), cadmium (Cd), or lead (Pb). 4.
PAGE 10
Mechanical information Figure 3. M4T28-BR12SH, M4T32-BR12SH Battery discharge rates LOAD CHARACTERISTICS 3.5 Temp: 20˚C Voltage (V) 3.0 2.5 BR1225 2.0 15kΩ 100kΩ 30kΩ 1.5 1.0 0 200 400 600 800 1000 1200 1400 1600 1800 2000 Duration (hrs.) (A) LOAD CHARACTERISTICS 3.5 Temp: 20˚C Voltage (V) 3.0 2.5 BR1632 2.0 15kΩ 30kΩ 50kΩ 100kΩ 1.5 1.0 0 1000 2000 3000 4000 Duration (hrs.) (B) Figure 4.
PAGE 11
M4T28-BR12SH, M4T32-BR12SH 5 Package mechanical data Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK® packages. These packages have a lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark.
PAGE 12
Package mechanical data Figure 6. M4T28-BR12SH, M4T32-BR12SH SH – 4-pin SNAPHAT® housing for 120 mAh battery & crystal, package outline A1 A2 A3 A eA B L eB D E SHTK-A Note: Drawing is not to scale. Table 5. SH – 4-pin SNAPHAT® housing for 120 mAh battery & crystal, package mechanical data mm inches Symb Typ Min A Typ Min 10.54 Max 0.415 A1 8.00 8.51 0.315 0.335 A2 7.24 8.00 0.285 0.315 A3 12/16 Max 0.38 0.015 B 0.46 0.56 0.018 0.022 D 21.21 21.84 0.835 0.
PAGE 13
M4T28-BR12SH, M4T32-BR12SH 6 Part numbering Part numbering Table 6. Ordering information scheme Example: M4T 28-BR12 SH 1 TR Device type M4T Battery voltage and capacity 28-BR12 = BR1225, 3 V, 48 mAh 32-BR12 = BR1632, 3 V, 120 mAh Package SH = SNAPHAT® Temperature range 1 = 0 to 70°C 6 = –40 to 85°C (M4T32-BR12SH only) Shipping method blank = Ecopack® package, tubes TR = Ecopack® package, tape & reel For a list of available options (e.g.
PAGE 14
Environmental information 7 M4T28-BR12SH, M4T32-BR12SH Environmental information Figure 7. Recycling symbols This product contains a non-rechargeable lithium (lithium carbon monofluoride chemistry) button cell battery fully encapsulated in the final product. Recycle or dispose of batteries in accordance with the battery manufacturer's instructions and local/national disposal and recycling regulations.
PAGE 15
M4T28-BR12SH, M4T32-BR12SH 8 Revision history Revision history Table 7. Document revision history Date Revision Nov-1999 1 Changes First issue 01-Mar-2001 2 04-Jun-2001 2.1 Basic textual changes from reformatting activity Reformatted 10-Jul-2001 2.2 Changes references to “supervisor” from “controller;” clarify temperature characteristics 21-Jan-2002 2.
PAGE 16
M4T28-BR12SH, M4T32-BR12SH Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale.