Features: `DROP-IN REPLACEMENT for PC COMPUTER CLOCK/CALENDAR
`COUNTS SECONDS, MINUTES, HOURS, DAYS, DAY of the WEEK, DATE, MONTH and YEAR with LEAP YEAR OMPENSATION
`INTERFACED WITH SOFTWARE AS 128 RAM LOCATIONS:
14 Bytes of Clock and Control Registers
114 Bytes of General Purpose RAM
`SELECTABLE BUS TIMING (Intel/Motorola)
`THREE INTERRUPTS are SEPARATELY SOFTWARE-MASKABLE and TESTABLE
Time-of-Day Alarm (Once/Second to Once/Day)
Periodic Rates from 122s to 500ms
End-of-Clock Update Cycle
`PROGRAMMABLE SQUARE WAVE OUTPUT
`SELF-CONTAINED BATTERY and CRYSTAL
i `the CAPHAT DIP PACKAGE
`PACKAGING INCLUDES a 28-LEAD SOIC and SNAPHAT® TOP (to be Ordered Separately)
`SOIC PACKAGE PROVIDES DIRECT CONNECTION for a SNAPHAT TOP CONTAINS the BATTERY and CRYSTAL
`PI N and FUNCTIO N COMPATIBLE with bq3285/7A and DS128887
Pinout
Specifications
|
Symbol |
Parameter |
Value |
Unit |
|
TA |
Ambient Operating Temperature Grade 1 Grade 6 |
0 to 70
|
°C |
|
TSTG |
Storage Temperature (VCC Off, Oscillator Off) |
40 to 85 |
°C |
|
T SLD (2) |
Lead Solder Temperature for 10 seconds |
260 |
°C |
|
VIO |
Input or Output Voltages |
0.3 to 7 |
V |
|
VCC |
Supply Voltage |
0.3 to 7 |
V |
|
PD |
Power Dissipation |
1 |
W |
Note: 1. Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to the absolute maximum rating conditions for extended periods of time may affect reliability. 2. Soldering temperature not to exceed 260°C for 10 seconds (total thermal budget not to exceed 150°C for longer than 30 seconds). CAUTION: Negative undershoots below 0.3V are not allowed on any pin while in the Battery Back-up mode. CAUTION: Do NOT wave solder SOIC to avoid damaging SNAPHAT sockets.
DescriptionThe M48T86 is an industry standard real time clock (RTC).The M48T86 is composed of a lithium energy source, quartz crystal, write-protection circuitry, and a 128 byte RAM array. This provides the user with a complete subsystem packaged in either a 24-pin DIP CAPHAT or 28-pin SNAPHAT SOIC. Functions available to the user include a non-volatile time-of-day clock, alarm interrupts, a one-hundred-year clock with programmable interrupts, square wave output, and 128 bytes of nonvolatile static RAM.
The 24 pin 600mil DIP CAPHAT™ houses the M48T86 silicon with a quartz crystal and a long life lithium button cell in a single package.
The 28 pin 330mil SOIC M48T86 provides sockets with gold plated contacts at both ends for direct connection to a separate SNAPHAT housing containing the battery and crystal. The unique design allo ws the SNAPHAT battery package of M48T86 to be mounted on top of the SOIC package after the completion of the surface mount process.
Insertion of the SNAPHAT M48T86 housing after reflow prevents potential battery and crystal damage due to the high temperatures required for device surface- mounting. The SNAPHAT housing is keyed to prevent reverse insertion.
The SOIC and battery packages of M48T86 are shipped separately in plastic anti-static tubes or in Tape & Reel form
M48T86 Data Sheet
