Datasheet

ManualsBrandsST ManualsBattery Charger ICsBattery for NV RAM

1/7November 1999

M4TXX-BR12SH

TIMEKEEPER SNAPHAT (Battery & Crystal)

■ Provides Battery Backup Power for Non-Volatile

TIMEKEEPERs and Controllers in the

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 Insure Proper Assembly

■ Removable for Replacement and Proper

Disposal

■ Available in Tubes or Tape & Reel

■ For Use with the 28 and 44 pin SOIC Versions

of the TIMEKEEPER Product Families

DESCRIPTION

The M4Txx-BR12SH SNAPHAT top is a detach-

able lithium power source for ST’s non-volatile

TIMEKEEPER surface mount SOIC (MH) pack-

age (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 avoids the battery and

crystal from having to be exposed to the high tem-

peratures of the surface mount process.

SNAPHAT (SH)

Battery & Crystal

Figure 1. Logic Diagram

AI02528

SNAPHAT

BAT–

BAT+

X1 X2

Summary of content (7 pages)

PAGE 1
M4TXX-BR12SH TIMEKEEPER SNAPHAT (Battery & Crystal) ■ Provides Battery Backup Power for Non-Volatile TIMEKEEPERs and Controllers in the 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 Insure Proper Assembly ■ Removable for Replacement and Proper Disposal ■ Available in Tubes or Tape & Reel ■ For Use w
PAGE 2
M4TXX-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. These sockets were designed with high point contact force to provide the lowest possible contact resistance.
PAGE 3
M4TXX-BR12SH Figure 3. Battery Discharge Rates LOAD CHARACTERISTICS 3.5 Temp: 20˚C Voltage (V) 3.0 2.5 2.0 15kΩ 30kΩ 100kΩ 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 2.0 15kΩ 30kΩ 50kΩ 100kΩ 1.5 1.0 0 1000 2000 3000 4000 Duration (hrs.) (B) BATTERY LIFE For information on Data Retention Life and Battery Storage Life, please refer to the Application Note AN1012. 5000 6000 AI02519 Figure 4.
PAGE 4
M4TXX-BR12SH Table 2. Ordering Information Scheme Example: M4T28-BR12 SH 1 Product Family M4T = SNAPHAT Battery & Crystal Battery Voltage & 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 For further information on any aspect of this device, please contact the STMicroelectronics Sales Office nearest to you.
PAGE 5
M4TXX-BR12SH Table 3. M4T28-BR12SH - TIMEKEEPER 4-pin SNAPHAT Housing for 48 mAh Battery & Crystal, Package Mechanical Data mm inches Symb Typ Min A Max Typ Min Max 9.78 0.385 A1 6.73 7.24 0.265 0.285 A2 6.48 6.99 0.255 0.275 A3 0.38 0.015 B 0.46 0.56 0.018 0.022 D 21.21 21.84 0.835 0.860 E 14.22 14.99 0.560 0.590 eA 15.55 15.95 0.612 0.628 eB 3.20 3.61 0.126 0.142 L 2.03 2.29 0.080 0.090 Figure 5.
PAGE 6
M4TXX-BR12SH Table 4. M4T32-BR12SH - TIMEKEEPER 4-pin SNAPHAT Housing for 120 mAh Battery & Crystal, Package Mechanical Data mm inches Symb Typ Min A Max Typ Min Max 10.54 0.415 A1 8.00 8.51 0.315 0.335 A2 7.24 8.00 0.285 0.315 A3 0.38 0.015 B 0.46 0.56 0.018 0.022 D 21.21 21.84 0.835 0.860 E 17.27 18.03 0.680 0.710 eA 15.55 15.95 0.612 0.628 eB 3.20 3.61 0.126 0.142 L 2.03 2.29 0.080 0.090 Figure 6.
PAGE 7
M4TXX-BR12SH If you have any questions or suggestions concerning the matters raised in this document, please send them to the following electronic mail addresses: apps.nvram@st.com (for application support) ask.memory@st.com (for general enquiries) Please remember to include your name, company, location, telephone number and fax number. Information furnished is believed to be accurate and reliable.