AT89C2051X2-16SI View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT89C2051X2-16SI

8-bit Microcontroller with 2K Bytes Flash

Atmel Corporation 

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Serial Port Timing: Shift Register Mode Test Conditions

VCC = 5.0V ± 20%; Load Capacitance = 80 pF

12 MHz Osc

Variable Oscillator

Symbol

Parameter

Min

Max

Min

Max

tXLXL

tQVXH

tXHQX

tXHDX

tXHDV

Serial Port Clock Cycle Time

Output Data Setup to Clock Rising Edge

Output Data Hold after Clock Rising Edge

Input Data Hold after Clock Rising Edge

Clock Rising Edge to Input Data Valid

1.0

12tCLCL

700

10tCLCL-133

50

2tCLCL-117

0

0

700

10tCLCL-133

Shift Register Mode Timing Waveforms

Units

µs

ns

ns

ns

ns

AC Testing Input/Output Waveforms(1)

Note: 1. AC Inputs during testing are driven at VCC - 0.5V for a logic 1 and 0.45V for a logic 0. Timing measurements are made at VIH

min. for a logic 1 and VIL max. for a logic 0.

Float Waveforms(1)

Note: 1. For timing purposes, a port pin is no longer floating when a 100 mV change from load voltage occurs. A port pin begins to

float when 100 mV change from the loaded VOH/VOL level occurs.

14 AT89C2051x2

3285B–MICRO–10/03

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