MC33064/MC34064
U
N D E RV O LTA G E
S
E N S I N G
C
I R C U I T
T
H E
I
N F I N I T E
P
O W E R
O F
I
N N O VA T I O N
P
R O D U C T I O N
D
A T A
S
H E E T
DESCRIPTION
The MC34064 is an undervoltage
sensing circuit designed specifically for
use as a reset controller in microproces-
sor-based systems. It offers the designer
an economical, space-efficient solution
for low supply voltage detection when
used in combination with a single pull-
up resistor. Adding one capacitor offers
the functionality of a programmable
delay time after power returns. The
34064 consists of a temperature stable
reference comparator with hysteresis,
high-current clamping diode and open
collector output stage capable of
sinking up to 60mA. The MC34064's
RESET output is specified to be fully
functional at V
IN
=1V. A major improve-
ment over competing products is the
glitch-free supply current during
undervoltage detection. Competing
products demand a step function
increase in operating current during the
time that you least want or need it....
during power loss. See Product
Highlight below.
K E Y F E AT U R E S
s
Monitors 5V Supplies
(V
T
= 4.6V Typ.)
s
Outputs Fully Defined At V
IN
= 1V
(See
Figure 1)
s
Glitch-Free Supply Current During
Switching
(See Product Highlight)
!
Ultra-Low Supply Current (500µA Max.)
!
Temperature Compensated I
CC
For
Extremely Stable Current Consumption
!
µP Reset Function Programmable With 1
External Resistor And Capacitor
!
Comparator Hysteresis Prevents Output
Oscillation
!
Electrically Compatible With Motorola
MC34064
!
Pin-to-Pin Compatible With Motorola
MC34064/MC34164.
NOTE:
For current data & package dimensions, visit our web site:
http://www.linfinity.com.
PRODUCT HIGHLIGHT
S
U P P LY
C
U R R E N T
400
385
370
355
340
325
310
295
280
265
250
-10
VS
.
I
N P U T
V
O L TA G E
APPLICATIONS
s
All Microprocessor Or Microcontroller
Designs Using 5V Supplies
R
L
= No Load
SWITCHING REGION
s
Simple 5V Undervoltage Detection
(I
CC
) Supply Current - ( A)
ACTIVE
REGION
MONITOR
REGION
-8
-6
-4
-2
0
2
4
6
8
10
Input Voltage less Threshold Voltage - (mV)
PA C K A G E O R D E R I N F O R M A T I O N
T
A
(°C)
0 to 70
-40 to 85
-55 to 125
DM
Plastic SOIC
8-pin
MC34064DM
MC33064DM
—
LP
Plastic TO-92
3-pin
MC34064LP
MC33064LP
—
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. MC34064DMT)
Copyright © 1999
Rev. 1.3 6/99
L
IN
F
INITY
M
ICROELECTRONICS
I
NC
.
11861 W
ESTERN
A
VENUE
, G
ARDEN
G
ROVE
, CA. 92841, 714-898-8121, F
AX
: 714-893-2570
1
MICROSEMI [ MICROSEMI CORPORATION ]
