Specifications
3–2
TMS 420 R3051, R3052 & R3081 Microprocessor Support Instruction Manual
Specifications
These specifications are for a probe adapter connected between a compatible
Tektronix logic analyzer and a SUT. Table 3–1 shows the electrical requirements
the SUT must produce for the support to acquire correct data.
In Table 3–1, for the 102/136-channel module, one podlet load is 20 k
in
parallel with 2 pF. For the 96-channel module, one podlet load is 100 k
in
parallel with 10 pF.
Table 3–1: Electrical specifications
Characteristics
Requirements
SUT DC power requirements
Voltage
4.75-5.25 VDC
Current
I maximum
455 mA
I typical
350 mA
SUT clock
Clock rate
Maximum
33 MHz
(40 MHz with probe adapter)
Minimum setup time required
All signals
4 ns
Minimum hold time required
All signals
4 ns
Specification
Measured typical SUT signal loading
AC load
DC load
A_D (31-4)
4 pF + 1 podlet
1 podlet
A_D (3-0)
10 pF + 2 podlets
2 podlets
Rd~, Daig_(1-0),
Busrst~_WrNr~, Addr_(1-0),
ALE
12 pF
74FR244
RdCEn~, Ack~, BusError~
11 pF
16R4-4 PLCC
BRcond (1-0), Sint_(0-2),
Int_(3-5), SBrcond_(3-2)
11 pF
16L8-5 in parallel
with podlet
Rsvd_(1-2), BusBnt~, Reset~
9 pF
1 podlet
SYSCLK~
10 pF
[
74FR244
[
This does not include the transmission line termination network of 100 pF in series
with 100
. With good clock signal quality you can remove the network to improve
signal quality.