Datasheet

1
2
3
4
8
7
6
5
GND
RTH
RES
RP
VDD
WDI
WP
WDO
PW PACKAGE
(TOP VIEW)
UCC2946-Q1
SGLS273B – OCTOBER 2004 – REVISED MARCH 2009 ................................................................................................................................................. www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
ORDERING INFORMATION
(1)
T
A
PACKAGE
(2)
ORDERABLE PART NUMBER
– 40 ° C to 105 ° C TSSOP – PW Reel of 3000 UCC2946TPWRQ1
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
web site at www.ti.com .
(2) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging .
TERMINAL FUNCTIONS
TERMINAL
I/O DESCRIPTION
NAME NO.
GND 1 — Ground reference for the device
This pin is high only if the voltage on the RTH has risen above 1.235 V. Once RTH rises above the threshold,
RES 3 O this pin remains low for the reset period. This pin asserts low and remains low if the RTH voltage dips below
1.235 V for an amount of time determined by Figure 1 .
This input compares its voltage to an internal 1.25-V reference. By using external resistors, a user can
RTH 2 I
program any desired reset threshold.
RP 4 I This pin allows the user to program the reset period by adjusting an external capacitor.
VDD 8 I Supply voltage for the device
This pin is the input to the watchdog timer. If this pin is not toggled or strobed within the watchdog period,
WDI 7 I
WDO is asserted.
This pin is the watchdog output. This pin is asserted low if the WDI pin is not strobed or toggled within the
WDO 5 O
watchdog period.
WP 6 I This pin allows the user to program the watchdog period by adjusting an external capacitor.
2 Submit Documentation Feedback Copyright © 2004 – 2009, Texas Instruments Incorporated
Product Folder Link(s): UCC2946-Q1