
MOTOROLA
M68040 USER’S MANUAL
C-17
TDI
TMS
TCLK
TDO
NO CONNECTION
+5V
1K
Figure C-10. Circuit Disabling IEEE Standard 1149.1A
C.6.5 MC68040V and MC68EC040V JTAG Electrical Characteristics
The following paragraphs provide information on JTAG electrical and timing specifications
This section is subject to change. For the most recent specifications, contact a Motorola
sales office or complete the registration card at the beginning of this manual.
JTAG DC Electrical Specifications—PRELIMINARY
Characteristic
Symbol
Min
Max
Unit
Input High Voltage
VIH
VIL
—
2
5.5
V
Input Low Voltage
GND
0.8
V
Overshoot
—
TBD
V
TCK Input Leakage Current @ 0.5–2.4 V
Iin
ITST
IL
TBD
TBD
μ
A
μ
A
TDO Hi-Z (Off-State) Leakage Current @ 0.5–2.4 V
TBD
TBD
Signal Low Input Current, VIL = 0.8 V
TMS, TDI
TBD
TBD
mA
Signal High Input Current, VIH = 2.0 V
TMS, TDI
IH
TBD
TBD
mA
TDO Output High Voltage IOH = 5ma
TDO Output Low Voltage IOL = 5ma
Capacitance*, Vin = 0 V, f = 1 MHz
*Capacitance is periodically sampled rather than 100% tested.
VOH
VOL
Cin
2.4
—
V
—
0.5
V
—
TBD
pF