TMS320F241FN datasheet(45/66 Pages) TI

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TMS320C242

DSP CONTROLLER

SPRS063B – DECEMBER 1997 – REVISED DECEMBER 1999

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)

IOH

300

µA (all outputs)

VLOAD =

1.5 V

110-pF typical load-circuit capacitance

Figure 14. Test Load Circuit

signal transition levels

The data in this section is shown for the 5-V version. Note that some of the signals use different reference

voltages, see the recommended operating conditions table. TTL-output levels are driven to a minimum

logic-high level of 2.4 V and to a maximum logic-low level of 0.7 V.

Figure 15 shows the TTL-level outputs.

0.7 V (VOL)

20%

2.4 V (VOH)

80%

Figure 15. 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 below 80% of the

total voltage range and lower and the level at which the output is said to be low is 20% of the total voltage

range and lower.

D For a low-to-high transition, the level at which the output is said to be no longer low is 20% of the total voltage

range and higher and the level at which the output is said to be high is 80% of the total voltage range and

higher.

Figure 16 shows the TTL-level inputs.

0.7 V (VIL)

10%

2.0 V (VIH)

90%

Figure 16. 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 90%

of the total voltage range and lower and the level at which the input is said to be low is 10% of the total voltage

range and lower.

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 10%

of the total voltage range and higher and the level at which the input is said to be high is 90% of the total

voltage range and higher.

TMS320F241FN Datasheet(PDF) 45 Page - Texas Instruments

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