Datasheet Linear Technology LTC2938

Manufacturer	Linear Technology
Series	LTC2938

Configurable 4-Supply Monitors with Watchdog Timer

Datasheets

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PDF, 259 Kb, File uploaded: Oct 25, 2017

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Packaging

	LTC2938CDE#PBF	LTC2938CDE#TRPBF	LTC2938CMS#PBF	LTC2938CMS#TRPBF	LTC2938HDE#PBF	LTC2938HDE#TRPBF	LTC2938HMS#PBF	LTC2938HMS#TRPBF	LTC2938IDE#PBF	LTC2938IDE#TRPBF	LTC2938IMS#PBF	LTC2938IMS#TRPBF
N	1	2	3	4	5	6	7	8	9	10	11	12
Package	4x3 DFN-12 Package Outline Drawing	4x3 DFN-12 Package Outline Drawing	MS-12 Package Outline Drawing	MS-12 Package Outline Drawing	4x3 DFN-12 Package Outline Drawing	4x3 DFN-12 Package Outline Drawing	MS-12 Package Outline Drawing	MS-12 Package Outline Drawing	4x3 DFN-12 Package Outline Drawing	4x3 DFN-12 Package Outline Drawing	MS-12 Package Outline Drawing	MS-12 Package Outline Drawing
Package Code	DE/UE	DE/UE	MS	MS	DE/UE	DE/UE	MS	MS	DE/UE	DE/UE	MS	MS
Package Index	05-08-1695	05-08-1695	05-08-1668	05-08-1668	05-08-1695	05-08-1695	05-08-1668	05-08-1668	05-08-1695	05-08-1695	05-08-1668	05-08-1668
Pin Count	12	12	12	12	12	12	12	12	12	12	12	12

Parametrics

Parameters / Models	LTC2938CDE#PBF	LTC2938CDE#TRPBF	LTC2938CMS#PBF	LTC2938CMS#TRPBF	LTC2938HDE#PBF	LTC2938HDE#TRPBF	LTC2938HMS#PBF	LTC2938HMS#TRPBF	LTC2938IDE#PBF	LTC2938IDE#TRPBF	LTC2938IMS#PBF	LTC2938IMS#TRPBF
Export Control	no	no	no	no	no	no	no	no	no	no	no	no
Features	Supervisor	Supervisor	Supervisor	Supervisor	Supervisor	Supervisor	Supervisor	Supervisor	Supervisor	Supervisor	Supervisor	Supervisor
Fourth Reset Voltage	1.8V, 1.5V, 1.2V, Adj, -Adj	1.8V, 1.5V, 1.2V, Adj, -Adj	1.8V, 1.5V, 1.2V, Adj, -Adj	1.8V, 1.5V, 1.2V, Adj, -Adj	1.8V, 1.5V, 1.2V, Adj, -Adj	1.8V, 1.5V, 1.2V, Adj, -Adj	1.8V, 1.5V, 1.2V, Adj, -Adj	1.8V, 1.5V, 1.2V, Adj, -Adj	1.8V, 1.5V, 1.2V, Adj, -Adj	1.8V, 1.5V, 1.2V, Adj, -Adj	1.8V, 1.5V, 1.2V, Adj, -Adj	1.8V, 1.5V, 1.2V, Adj, -Adj
Isupply, µA	80	80	80	80	80	80	80	80	80	80	80	80
Minimum Reset Level, V	1	1	1	1	1	1	1	1	1	1	1	1
Number of Supplies	4	4	4	4	4	4	4	4	4	4	4	4
Operating Temperature Range, °C	0 to 70	0 to 70	0 to 70	0 to 70	-40 to 125	-40 to 125	-40 to 125	-40 to 125	-40 to 85	-40 to 85	-40 to 85	-40 to 85
Power Fail Warning	no	no	no	no	no	no	no	no	no	no	no	no
Power Up/Down Reset	no	no	no	no	no	no	no	no	no	no	no	no
Reset Voltage	5V, 3.3V	5V, 3.3V	5V, 3.3V	5V, 3.3V	5V, 3.3V	5V, 3.3V	5V, 3.3V	5V, 3.3V	5V, 3.3V	5V, 3.3V	5V, 3.3V	5V, 3.3V
Second Reset Voltage	3.3V, 2.5V, 1.8V, 1.5V, 1.2V	3.3V, 2.5V, 1.8V, 1.5V, 1.2V	3.3V, 2.5V, 1.8V, 1.5V, 1.2V	3.3V, 2.5V, 1.8V, 1.5V, 1.2V	3.3V, 2.5V, 1.8V, 1.5V, 1.2V	3.3V, 2.5V, 1.8V, 1.5V, 1.2V	3.3V, 2.5V, 1.8V, 1.5V, 1.2V	3.3V, 2.5V, 1.8V, 1.5V, 1.2V	3.3V, 2.5V, 1.8V, 1.5V, 1.2V	3.3V, 2.5V, 1.8V, 1.5V, 1.2V	3.3V, 2.5V, 1.8V, 1.5V, 1.2V	3.3V, 2.5V, 1.8V, 1.5V, 1.2V
Third Reset Voltage	2.5V, 1.8V, 1.5V, 1.2V, Adj	2.5V, 1.8V, 1.5V, 1.2V, Adj	2.5V, 1.8V, 1.5V, 1.2V, Adj	2.5V, 1.8V, 1.5V, 1.2V, Adj	2.5V, 1.8V, 1.5V, 1.2V, Adj	2.5V, 1.8V, 1.5V, 1.2V, Adj	2.5V, 1.8V, 1.5V, 1.2V, Adj	2.5V, 1.8V, 1.5V, 1.2V, Adj	2.5V, 1.8V, 1.5V, 1.2V, Adj	2.5V, 1.8V, 1.5V, 1.2V, Adj	2.5V, 1.8V, 1.5V, 1.2V, Adj	2.5V, 1.8V, 1.5V, 1.2V, Adj
Threshold Accuracy, %	1.5	1.5	1.5	1.5	1.5	1.5	1.5	1.5	1.5	1.5	1.5	1.5
Vs Max, V	6	6	6	6	6	6	6	6	6	6	6	6
Watchdog Timer	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes

Eco Plan

	LTC2938CDE#PBF	LTC2938CDE#TRPBF	LTC2938CMS#PBF	LTC2938CMS#TRPBF	LTC2938HDE#PBF	LTC2938HDE#TRPBF	LTC2938HMS#PBF	LTC2938HMS#TRPBF	LTC2938IDE#PBF	LTC2938IDE#TRPBF	LTC2938IMS#PBF	LTC2938IMS#TRPBF
RoHS	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant

Other Options

LTC2939

Articles

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4- and 6-Supply Monitors Feature ±1.5% Accuracy and Watchdog Timers for Rails Down to 1.2V &mdash LT Journal
PDF, 826 Kb, File published: Oct 27, 2010
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design features 4-and 6-Supply Monitors Feature В±1.5% Accuracy and
Watchdog Timers for Rails Down to 1.2V
A. Ng Two new power supply monitors from Linear Technology, the LTC2938 and LTC2939,
are specifically designed to monitor lower supply voltages (down to 1.2V) in multivoltage
systems. The LTC2938 and LTC2939 share the same architecture and differ only in
the number of voltages monitored. The LTC2938 is a 4-supply monitor and comes in
compact 12-pin MSOP and DFN packages. The LTC2939 monitors six supplies and
is offered in a 16-pin MSOP package. Both monitors have a tight threshold accuracy
of 1.5% over the operating temperature range, which eases the voltage headroom
requirements of circuits powered by the monitored supplies and is much tighter than
supply monitors from other manufacturers. Neither monitor requires external calibration
or trimming. Both parts are designed for systems with 5% power supply tolerance.
The watchdog circuit in these monitors includes a watchdog input (WDI)
and a watchdog output (WDO), which
facilitates microprocessor monitoring
and control. The WDO output is latched
low in the event of a watchdog timeout
and allows the microprocessor to distinguish between resets caused by a supply
undervoltage from those due to software
malfunction. Both devices feature reset
and watchdog timers that can be arbitrarily adjusted using external capacitors
for greater flexibility in system design. SINGLE PIN SELECTS FROM
16 POSSIBLE THRESHOLD …

Model Line

Series: LTC2938 (12)

LTC2938CDE#PBF LTC2938CDE#TRPBF LTC2938CMS#PBF LTC2938CMS#TRPBF LTC2938HDE#PBF LTC2938HDE#TRPBF LTC2938HMS#PBF LTC2938HMS#TRPBF LTC2938IDE#PBF LTC2938IDE#TRPBF LTC2938IMS#PBF LTC2938IMS#TRPBF

Manufacturer's Classification

Monitor, Control and Protection > Supervisory Circuits > Quad or More Supply Monitors
Space & Harsh Environment > Extended Temperature Plastic (H & MP) > Extended Temperature (H & MP) System Monitor