TMS320C51 datasheet(49/87 Pages) TI

49 / 87 page

TMS320C5x, TMS320LC5x

DIGITAL SIGNAL PROCESSORS

SPRS030A – APRIL 1995 – REVISED APRIL 1996

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

PARAMETER MEASUREMENT INFORMATION

Tester Pin

Electronics

VLoad

IOL

IOH

Output

Under

Test

Ω

Where:

IOL

2 mA (all outputs) minimum

IOH

300

µA (all outputs) minimum

VLOAD =

1.5 V

80-pF typical load circuit capacitance

Figure 9. Test Load Circuit

signal transition levels

The data in this section is shown for both the 5-V version (’C5x) and the 3.3-V version (’LC5x). In each case,

the 5-V data is shown followed by the 3.3-V data in parentheses. TTL-output levels are driven to a minimum

logic-high level of 2.4 V (2 V) and to a maximum logic-low level of 0.6 V (0.4 V). Figure 10 shows the TTL-level

outputs.

0.6 V (0.4 V)

1 V (0.8 V)

2 V (1.6 V)

2.4 V (2 V)

Figure 10. TTL-Level Outputs

TTL-output transition times are specified as follows:

D For a high-to-low transition, the level at which the output is said to be no longer high is 2 V (1.6 V), and the

level at which the output is said to be low is 1 V (0.8 V).

D For a low-to-high transition, the level at which the output is said to be no longer low is 1 V (0.8 V), and the

level at which the output is said to be high is 2 V (1.6 V).

Figure 11 shows the TTL-level inputs.

2 V (1.8 V)

0.8 V (0.6 V)

Figure 11. TTL-Level Inputs

TTL-compatible input transition times are specified as follows:

D For a high-to-low transition on an input signal, the level at which the input is said to be no longer high is

2 V (1.8 V), and the level at which the input is said to be low is 0.8 V (0.6 V).

D For a low-to-high transition on an input signal, the level at which the input is said to be no longer low is

0.8 V (0.6 V), and the level at which the input is said to be high is 2 V (1.8 V).

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