Skip to main content Skip to first level navigation

RICOH imagine. change.

RICOH ELECTRONIC DEVICES CO., LTD.

Skip to main content First level navigation Menu
Main content

R8355 Series
Watchdog Timer Equipped with Inhibit Pin with VD

Product Specifications

The R8355 Series are CMOS-based system power ICs with a voltage detector (VD) and watchdog timer (WDT) integrated in a single chip. R8355 monitors the power system of devices equipped with microprocessors and prevents system runaway with a reset signal when a malfunction occurs. The output delay time of the VD and watchdog timeout period/reset time can be adjusted high accuracy by an external capacitor.

FEATURES

Operating Voltage Range (Maximum Rating) 0.9 V to 6.0 V (7.0 V)
Operating Temperature Range −40°C to 125°C
Supply Current Typ. 11 µA
< Voltage Detector Part >
Detector Threshold Range 1.5 V to 5.5 V (0.1V steps)
Detector Threshold Accuracy ±1.0%
Detector Threshold Temperature Coefficient Typ. ±100 ppm/°C (−40°C≤Ta≤110°C)
Power-on Reset Delay Time Accuracy ±16%* (−40°C≤Ta≤110°C)
Power-on Reset Delay Time Typ. 350 ms (CD= 0.1 µF) *Adjustable by external capacitor
< Watchdog Timer Part >
Watchdog Timeout Period Accuracy ±33%* (−40°C≤Ta≤110°C)
Watchdog Timeout Period Typ. 310 ms (CTW= 0.1 µF) *Adjustable by external capacitor
Reset Timer Typ. 34 ms (CTW= 0.1 µF) *Adjustable by external capacitor
Package SOT-23-6

* Accuracy to center value of (Min.+Max.)/2

APPLICATION INFORMATION

PIN DESCRIPTION

SOT-23-62.9 mm × 2.8 mm

SOT-23-6

1 SCK
2 CTW
3 VDD
4 RESETB
5 GND
6 CD

R8355 Series for Automotive

Ricoh is committed to providing a semiconductor device with the highest level of quality and reliability by restricting the device manufacturing only within Ricoh and the cooperative companies successfully passed our stringent inspections for automotive products. Ricoh established a traceability system and manages manufacturing information and logistics information from the warehouse.


Quality Ranks for Applications

Ricoh offers three different quality ranks for automotive products according to their application purposes.
R8355 Series offer products in Rank 1.

Rank 1: Safety-Critical Automotive Parts (Operation Control System)

  • Supervisory circuit for operation control equipments such as power steering, shift by wire, and TPMS

AEC-Q100 Grade 1 Compliant


PRODUCT LONGEVITY PROGRAM

R8355 series operate PRODUCT LONGEVITY PROGRAM (ten-year supply is maintained as of January, 2016).
This program has been introduced to help customers select the most appropriate part for applications that require long life cycles.


Operating Temperature Range : -40°C to 125°C


Tjmax 150°C

The R8355 series are rated at high temperature of Tjmax = 150°C. The power dissipation is also rated at high temperature.


SELECTION GUIDE

The detector threshold, the output type and the taping type for the ICs can be selected at the users’ request.

Product Name   Package Quantity per Reel
R8355Nxx1#-TR-FE AutomotiveSafety-Critical Automotive PartsAEC-Q100PLP SOT-23-6 3,000
  • xx … Set Detector Threshold (-VSET) can be designated in the range from 1.5V(15) to 5.5V(55) in 0.1V steps.
  • # … Designation of Output Type
    A: Nch Open Drain
    C: CMOS

Inquiry about products

Technical Support

Inquiries (SSL Form)

Inquiry about business

Purchase, Request for Samples and Documents

Distributors

Sample Online

Online Distributors