MAX847
1-Cell, Step-Up
Two-Way Pager System IC
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(OUT = 3.0V, BATT = 1.2V, NICD = 3.6V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
BATT, OUT, NICD, LBO, RSO to AGND...................-0.3V to +6V
REG1, OFS, REG2, REF, R2IN to AGND...-0.3V to (OUT + 0.3V)
SCL, SDO, SDI,
CS , SYNC, FILT, DR2IN,
CH0, LBI, RSIN, RUN to AGND...................-0.3V to (REG1 + 0.3V)
REG3 .......................................................-0.3V to (REG2 + 0.3V)
DR1, DR2 to DRGND ...............................-0.3V to (BATT + 0.3V)
PGND, DRGND to AGND......................................-0.3V to +0.3V
LX1 to PGND .............................................-0.3V to (OUT + 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
28-Pin QSOP (derate 8mW/°C above +70°C) .............640mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +165°C
Lead Temperature (soldering, 10sec).............................+300°C
T
A
= +25°C
Run or Coast Mode
Incremental supply current when on
REG2, REG3 and CH DAC off, V
OUT
= 2.8V
REG2, REG3 and CH DAC on
Coast mode
Incremental supply current when on
CONDITIONS
V0.9 1.1
BATT Minimum Start-Up Voltage
(Note 3)
V
0.8
OUT x
0.8
BATT Typical Operating Range
(Note 2)
µA30CH DAC Supply Current (Note 4)
µA13 25Coast Mode Supply Current (Note 4)
µA875 1350Run Mode Supply Current (Note 4)
µA0.5 2BATT Supply Current (Note 5)
µA20REG3 Supply Current (Note 4)
UNITSMIN TYP MAXPARAMETER
I
REF
= 0 to 20µA, OUT = 1.8V to 4.9V V-1.5% 1.28 1.5%Reference Voltage
I
DR
= 120mA
Ω
1.8 2.8
DR1, DR2 On-Resistance
V
DR
= 5V nA1 250DR1, DR2 Leakage Current
T
A
= +25°C
T
A
= -40°C to +85°C
I
SDO
= 100µA mV200SDO Output Low
I
SDO
= -100µA, from REG1 V
V
REG1
- 0.2
SDO Output High
Includes CS, SDI, SCL, DR2IN, SYNC, and RUN
V0.4Logic Input Level Low
Includes CS, SDI, SCL, DR2IN, SYNC, and RUN
V
V
REG1
- 0.4
Logic Input Level High
3.6
50% duty cycle MHz5SCL Maximum Clock Rate
ns100SDI Setup Time, t
DS
ns50SDI Hold Time, t
DH
Logic Input = 0 to 3.3V; includes CS, SDI, SCL,
DR2IN, SYNC, and RUN
µA-1 1Logic Input Current
Charger and Backup Modes off, NICD = 3.6V µA1.2 3
NICD Input Current, Standby
(Note 6)
Incremental supply current when on µA
Backup mode, NICD = 3.6V, OUT = 3V
50REG2 Supply Current (Note 4)
µA20 40
NICD Input Supply Current, Backup
(Note 7)
Charger and Backup Modes off,
BATT = 0V and OUT = 0V
µA1.2 3
NICD Input Current, Power Fail
(Note 8)
GENERAL PERFORMANCE
SERIAL-INTERFACE TIMING SPECIFICATIONS (Note 9)
