BQ3285 Datasheet, PDF (20/22 Pages) Texas Instruments – Real-Time Clock RTC

bq3285
28-Pin Quad PLCC (Q)
28-Pin Quad PLCC (Q)
Dimension
A
A1
B
B1
C
D
D1
D2
E
E1
E2
e
Minimum
0.165
0.020
0.012
0.025
0.008
0.485
0.445
0.390
0.485
0.445
0.390
0.045
All dimensions are in inches.
Maximum
0.180
-
0.021
0.033
0.012
0.495
0.455
0.430
0.495
0.455
0.430
0.055
Data Sheet Revision History
Change No.
1
1
Page No.
2
11
Description
Address strobe input
Backup cell voltage VBC
1
12
Power-fail detect voltage VPFD
2
3, 12
Crystal type Daiwa DT-26 (not DT-26S)
3
12
Changed value in first table
3
12
Changed value in first table
3
4
Notes:
12
Changed values for conditions of IRCL, IMOTH
1, 8, 20
PLCC last time buy and Reg A update
Change 1 = Nov. 1992 B changes from June 1991 A.
Change 2 = Nov. 1993 C changes from Nov. 1992 B.
Change 3 = Sept. 1996 D changes from Nov. 1993 C
Change 4 = Jan. 1999 E changes from Sept. 1996 D
Nature of Change
Clarification
Was 2.0 min; is 2.5 min
Was 4.1 min, 4.25 max;
is 4.0 min, 4.35 max
Clarification
IRCL max. was 275; is now 185
IMOTH max. was -275; is now
-185
Was 20K; is now 30K
Reg A labeling corrected
Jan. 1999 E
20