TSC87C51 TEMIC Semiconductors, TSC87C51 Datasheet - Page 20

• Manufacturer Part Number: TSC87C51
• Description: CMOS 0 to 25 MHz Programmable 8-bit Microcontroller
• Manufacturer: TEMIC Semiconductors

20
TSC87C51
External Clock Drive Characteristics (XTAL1)
External Clock Drive Waveforms
AC Testing Input/Output Waveforms
AC inputs during testing are driven at VCC – 0.5 for a logic “1” and 0.45V for a logic “0”. Timing measurement are
made at VIH min for a logic “1” and VIL max for a logic “0”.
Float Waveforms
For timing purposes as port pin is no longer floating when a 100 mV change from load voltage occurs and begins to
float when a 100 mV change from the loaded VOH/VOL level occurs. IOL/IOH
Symbol
TCHCX
TCLCL
TCLCX
TCLCH
TCHCL
INPUT/OUTPUT
0.45V
VCC–0.5V
Oscillator Period
High Time
Low Time
Rise Time
Fall Time
0.2VCC–0.1
VCC –0.5 V
0.7VCC
Parameter
VOH – 0.1 V
VOL + 0.1 V
0.45 V
TCHCL
FLOAT
VLOAD
TCLCX
0.2 VCC + 0.9
0.2 VCC – 0.1
Min
TCLCL
VLOAD + 0.1 V
VLOAD – 0.1 V
40
5
5
TCLCH
TCHCX
20mA.
Max
5
5
Rev. E
–
July 03, 2000
Units
ns
ns
ns
ns
ns