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| 型号： | SMQ320C32PCMM50 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 数字信号处理 |
| 英文描述： | 24-BIT, 50 MHz, OTHER DSP, PQFP144 |
| 封装： | PLASTIC, QFP-144 |
| 文件页数： | 11/50页 |
| 文件大小： | 674K |
| 代理商： | SMQ320C32PCMM50 |
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SMQ320C32
DIGITAL SIGNAL PROCESSOR
SGUS027B – APRIL 1998 – REVISED MARCH 1999
19
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
PARAMETER MEASUREMENT INFORMATION (CONTINUED)
signal-transition levels
TTL-level outputs are driven to a minimum logic-high level of 2.4 V and to a maximum logic-low level of 0.6 V.
Output transition times are specified in the following paragraph.
For a high-to-low transition on a TTL-compatible output signal, the level at which the output is said to be no
longer high is 2 V and the level at which the output is said to be low is 1 V. For a low-to-high transition, the level
at which the output is said to be no longer low is 1 V and the level at which the output is said to be high is 2 V
(see Figure 12).
0.6 V
1 V
2 V
2.4 V
Figure 12. TTL-Level Outputs
Transition times for TTL-compatible inputs are specified as follows. 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 and the level at which the input is said to
be low is 0.8 V. 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 and the level at which the input is said to be high is 2 V (see Figure 13).
2 V
0.8 V
Figure 13. TTL-Level Inputs
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