TMS370C756 Datasheet, PDF (58/75 Pages) Texas Instruments – 8-BIT MICROCONTROLLER

TMS370Cx5x
8-BIT MICROCONTROLLER
SPNS010F – DECEMBER 1986 – REVISED FEBRUARY 1997
PARAMETER MEASUREMENT INFORMATION
XTAL2/CLKIN
XTAL1
XTAL2/CLKIN
XTAL1
C1
(see Note B)
Crystal/Ceramic
Resonator
(see Note A)
C2
(see Note B)
External
Clock Signal
C3
(see Note B)
NOTES: A. The crystal/ceramic resonator frequency is four times the reciprocal of the system clock period.
B. The values of C1 and C2 are typically 15 pF and C3 is typically 50 pF. See the manufacturer’s recommendations for ceramic
resonators.
Figure 19. Recommended Crystal/Clock Connections
Load Voltage
1.2 kΩ
VO
20 pF
Case 1: VO = VOH = 2.4 V; Load Voltage = 0 V
Case 2: VO = VOL = 0.4 V; Load Voltage = 2.1 V
NOTE A: All measurements are made with the pin loading as shown unless otherwise noted. All measurements are made with XTAL2/CLKIN
driven by an external square wave signal with a 50% duty cycle and rise and fall times less than 10 ns unless otherwise stated.
Figure 20. Typical Output Load Circuit (see Note A)
VCC
VCC
300 Ω
30 Ω
I/O
20 Ω
Pin Data
Output
Enable
6 kΩ
INT1
20 Ω
GND
GND
Figure 21. Typlcal Buffer Circuitry
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