October 1998 7-49
MIC58P42 Micrel
7
VEE
OUTPUT
ENABLE/RESET
STROBE
SERIAL DATA OUT
VDD
VSS
SERIAL DATA IN
CLOCK
VEE
K
OUT8
OUT7
OUT6
OUT5
OUT4
OUT3
OUT2
OUT1
SHIFT REGISTER
LATCHES
SUB
UVLO THERMAL
SHUTDOWN
SUB I LIMIT
9
8
7
6
5
4
3
2
1
10
11
12
13
14
15
16
17
18
General Description
The MIC58P42 serial-input latched driver is a high-voltage
(80V), high-current (500mA) integrated circuit comprised of
eight CMOS data latches, a bipolar Darlington transistor
driver for each latch, and CMOS control circuitry for the
common STROBE, CLOCK, SERIAL DATA INPUT, and
OUTPUT ENABLE functions. Similar to the MIC5842, additional
protection circuitry supplied on this device includes
thermal shutdown, under voltage lockout (UVLO), and overcurrent
shutdown.
The bipolar/CMOS combination provides an extremely lowpower
latch with maximum interface flexibility. The MIC58P42
has open-collector outputs capable of sinking 500 mA and
integral diodes for inductive load transient suppression with
a minimum output breakdown voltage rating of 80V (50V
sustaining). The
drivers can be operated with a split supply,
where the negative supply is down to –20V and may be
paralleled for higher load current capability.
With a 5V logic supply, the MIC58P42 will typically operate at
better than 5MHz. With a 12V logic supply, significantly
higher speeds are obtained. The CMOS inputs are compatible
with standard CMOS, PMOS, and NMOS circuits. TTL
circuits may require pull-up resistors. By using the serial data
output,
drivers may be cascaded for interface applications
requiring additional drive lines.
Each of these eight outputs has an independent over current
shutdown of 500 mA. Upon over-current detection, the
affected channel will turn OFF until VDD is cycled or the
ENABLE/RESET pin is pulsed high. Current pulses less than
2ms will not activate current shutdown. Temperatures above
165°C will shut down the device. The UVLO circuit prevents
operation at low VDD; hysteresis of 0.5V is provided. See the
MIC59P60 for a similar device that additionally provides an
error flag output.
Features
• 3.3 MHz Minimum Data-Input Rate
• CMOS, PMOS, NMOS, and TTL Compatible
• Internal Pull-Up/Pull-Down Resistors
• Low Power CMOS Logic and Latches
• High Voltage (80V) Current-Sink Outputs
• Output Transient-Protection Diodes
• Single or Split Supply Operation
• Thermal Shutdown
• Under-Voltage Lockout
• Per-Output Over-Current Shutdown (500mA typical)
Ordering Information
Part Number Temperature Range Package
MIC58P42BN –40°C to +85°C 18-Pin Plastic DIP
MIC58P42BV –40°C to +85°C 20-Pin PLCC
MIC58P42BWM –40°C to +85°C 18-Pin Wide SOIC
Pin Configuration
(DIP and SOIC)
Functional Diagram
CLOCK
SERIAL
DATA IN
VSS
UVLO
THERMAL
SHUTDOWN
ILIMIT
K OUT1 OUT2 OUT3 OUT4 OUT5 OUT6 OUT7 OUT8
SUB
VEE
MOS
BIPOLAR
SERIAL DATA OUT
VDD
STROBE
OUTPUT
ENABLE/RESET
8-BIT SERIAL–PARALLEL SHIFT REGISTER
LATCHES
1
2
3
4
5
6
7
8
10 18 17 16 15 14 13 12 11 9
MIC58P42
8-Bit Serial-Input Protected Latched Driver
