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Part: TLC7725IPWR
Category:
Power Management
-> Supervisory Circuits
Description: ti TLC7725, Micropower Supply Voltage Supervisor
Company: Texas Instruments, Inc.
Datasheet: Download TLC7725IPWR datasheet File size : 548 kB
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Datasheet text preview:
TLC7701, TLC7725, TLC7703, TLC7733, TLC7705 MICROPOWER SUPPLY VOLTAGE SUPERVISORS
SLVS087L DECEMBER 1994 REVISED FEBRUARY 2003
D D D D D D D D D D D
Power-On Reset Generator Automatic Reset Generation After Voltage Drop Precision Voltage Sensor Temperature-Compensated Voltage Reference Programmable Delay Time by External Capacitor Supply Voltage Range . . . 2 V to 6 V Defined RESET Output from VDD 1 V Power-Down Control Support for Static RAM With Battery Backup Maximum Supply Current of 16 µA Power Saving Totem-Pole Outputs Temperature Range . . . Up to 55°C to 125°C
D, JG, P OR PW PACKAGE (TOP VIEW)
CONTROL RESIN CT GND
1 2 3 4
8 7 6 5
VDD SENSE RESET RESET
U PACKAGE (TOP VIEW)
NC CONTROL RESIN CT GND
1 2 3 4 5
10 9 8 7 6
NC VDD SENSE RESET RESET
description
The TLC77xx family of micropower supply voltage supervisors provide reset control, primarily in microcomputer and microprocessor systems. During power-on, RESET is asserted when VDD reaches 1 V. After minimum VDD ( 2 V) is established, the circuit monitors SENSE voltage and keeps the reset outputs active as long as SENSE voltage (VI(SENSE)) remains below the threshold voltage. An internal timer delays return of the output to the inactive state to ensure proper system reset. The delay time, td, is determined by an external capacitor: td = 2.1 × 104 × CT Where CT is in farads td is in seconds
FK PACKAGE (TOP VIEW)
NC RESIN NC CT NC
4 5 6 7 8
3 2 1 20 19 18 17 16 15 14 9 10 11 12 13
NC CONTROL NC VDD NC NC SENSE NC RESET NC
Copyright 1994 2003, Texas Instruments Incorporated
Except for the TLC7701, which can be customized with two external resistors, each supervisor has a fixed SENSE threshold voltage set by an internal voltage divider. When SENSE voltage drops below the threshold voltage, the outputs become active and stay in that state until SENSE voltage returns above threshold voltage and the delay time, td, has expired.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
RESET NC
NC GND NC
1
TLC7701, TLC7725, TLC7703, TLC7733, TLC7705 MICROPOWER SUPPLY VOLTAGE SUPERVISORS
SLVS087L DECEMBER 1994 REVISED FEBRUARY 2003
description (continued)
In addition to the power-on-reset and undervoltage-supervisor function, the TLC77xx adds power-down control support for static RAM. When CONTROL is tied to GND, RESET will act as active high. The voltage monitor contains additional logic intended for control of static memories with battery backup during power failure. By driving the chip select (CS) of the memory circuit with the RESET output of the TLC77xx and with the CONTROL driven by the memory bank select signal (CSH1) of the microprocessor (see Figure 10), the memory circuit is automatically disabled during a power loss. (In this application the TLC77xx power has to be supplied by the battery.) The TLC77xxI is characterized for operation over a temperature range of 40°C to 85°C; the TLC77xxQ is characterized for operation over a temperature range of 40°C to 125°C; and the TLC77xxM is characterized for operation over the full Military temperature range of 55°C to 125°C.
AVAILABLE OPTIONS PACKAGED DEVICES TA THRESHOLD VOLTAGE (V) 1.1 40°C to 85°C 2.25 2.63 2.93 4.55 1.1 40°C to 125°C 55°C to 125°C 2.25 2.63 2.93 4.55 2.93 4.55 SMALL OUTLINE (D) TLC7701ID TLC7725ID TLC7703ID TLC7733ID TLC7705ID TLC7701QD TLC7725QD TLC7703QD TLC7733QD TLC7705QD -- -- CHIP CARRIER (FK) -- -- -- -- -- -- -- -- -- -- TLC7733MFK TLC7705MFK CERAMIC DIP (JG) -- -- -- -- -- -- -- -- -- -- TLC7733MJG TLC7705MJG CERAMIC DUAL FLATPACK (U) -- -- -- -- -- -- -- -- -- -- -- TLC7705MU PLASTIC DIP (P) TLC7701IP TLC7725IP TLC7703IP TLC7733IP TLC7705IP TLC7701QP TLC7725QP TLC7703QP TLC7733QP TLC7705QP -- -- THIN SHRINK SMALL OUTLINE (PW) TLC7701IPW TLC7725IPW TLC7703IPW TLC7733IPW TLC7705IPW TLC7701QPW TLC7725QPW TLC7703QPW TLC7733QPW TLC7705QPW -- --
The D package is available taped and reeled. Add the suffix R to the device type when ordering (e.g., TLC7705QDR). The PW package is only available left-end taped and reeled (indicated by the LE suffix on the device type; e.g., TLC7705QPWLE). FUNCTION TABLE CONTROL L L L L H H H H RESIN L L H H L L H H VI(SENSE)>VIT+ False True False True False True False True RESET H H H L§ H H H H RESET L L L H§ L L L H§ 1 RESIN CT 2 3 SENSE 7 S
logic symbol¶
COMP S×
CX 1 2 1 3 1
Z2 Z3 5 6 RESET RESET
CONTROL
§ RESET and RESET states shown are valid for t > td.
¶ This symbol is in accordance with ANSI/IEEE Std 911984 and IEC Publication 617-12.
2
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
TLC7701, TLC7725, TLC7703, TLC7733, TLC7705 MICROPOWER SUPPLY VOLTAGE SUPERVISORS
SLVS087L DECEMBER 1994 REVISED FEBRUARY 2003
functional block diagram
8 CONTROL 1 50 µA 6 VDD RESET
5 RESIN 2
RESET
SENSE
7
R1
R2
1 M 1.1 V 3 CT
4
GND
Outputs are totem-pole configuration. External pullup or pulldown resistors are not required. Nominal values: R1 (Typ) TLC7701 TLC7725 TLC7703 TLC7733 TLC7705 0 600 k 698 k 750 k 910 k R2 (Typ)
600 k 502 k 450 k 290 k
timing diagram
VDD and VI(SENSE) VIT+ Threshold Voltages VIT Vres t RESET Output Output Undefined VIT+
POST OFFICE BOX 655303
ÎÎ ÎÎ
td
td
t
· DALLAS, TEXAS 75265
3
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