90E21 datasheet(51/57 Pages) IDT

Part #	90E21

Description	Single-Phase High-Performance Wide-Span Energy Metering IC

PDF	57 Pages

Scroll/Zoom	100%

Manufacturer	IDT [Integrated Device Technology]

Direct Link	http://www.idt.com

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51 / 57 page

90E21/22/23/24

SINGLE-PHASE HIGH-PERFORMANCE WIDE-SPAN ENERGY METERING IC

Electrical Specification

January 10, 2012

6.3

POWER ON RESET TIMING

Figure-12 Power On Reset Timing Diagram

6.4

ZERO-CROSSING TIMING

Figure-13 Zero-Crossing Timing Diagram

tDW

Minimum Data Width

30T+10

tPD

Output Delay

14T

15T+20

tDF

note 1

Output Disable Time

16T+20

Note:

1. Not applicable for three-wire SPI.

2. T means SCLK cycle. T=122ns. (Typical value for four-wire SPI)

Table-12 SPI Timing Specification (Continued)

Table-13 Power On Reset Specification

Symbol

Description

Min.

Typical

Max.

Unit

Power On Trigger Voltage

2.47

2.6

2.73

Power Off Trigger Voltage

2.185

2.3

2.415

VH-VL

Hysteretic Voltage Difference

0.285

0.3

0.315

Delay Time After Power On

Delay Time After Power Off

µs

DVDD

RESET

(Positive zero-crossing)

(Negative zero-crossing)

(All zero-crossing)

90E21 Datasheet(PDF) 51 Page - Integrated Device Technology

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