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80C451 Datasheet, PDF (16/22 Pages) NXP Semiconductors – 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, expanded I/O | |||
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Philips Semiconductors
80C51 8-bit microcontroller family
4K/128 OTP/ROM/ROMless, expanded I/O
Product specification
80C451/83C451/87C451
VCCâ0.5
0.45V
0.7VCC
0.2VCCâ0.1
tCHCL
tCLCX
tCHCX
tCLCH
tCLCL
Figure 10. External Clock Drive
SU00009
VCCâ0.5
0.2VCC+0.9
0.45V
0.2VCCâ0.1
NOTE:
AC inputs during testing are driven at VCC â0.5 for a logic â1â and 0.45V for a logic â0â.
Timing measurements are made at VIH min for a logic â1â and VIL max for a logic â0â.
Figure 11. AC Testing Input/Output
SU00010
VLOAD
VLOAD+0.1V
VLOADâ0.1V
TIMING
REFERENCE
POINTS
VOHâ0.1V
VOL+0.1V
NOTE:
For timing purposes, a port is no longer floating when a 100mV change from load voltage occurs,
and begins to float when a 100mV change from the loaded VOH/VOL level occurs. IOH/IOL ⥠±20mA.
SU00011
Figure 12. Float Waveform
30
MAX ACTIVE MODE
25
20
ICC mA 15
10
TYP ACTIVE MODE
5
MAX IDLE MODE
TYP IDLE MODE
4MHz 8MHz 12MHz 16MHz
FREQ AT XTAL1
VALID ONLY WITHIN FREQUENCY SPECIFICATIONS OF THE DEVICE UNDER TEST.
SU00092
Figure 13. ICC vs. FREQ
1998 May 01
16
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