参数资料
型号: IDT79RC32K438-233BBI
厂商: IDT, Integrated Device Technology Inc
文件页数: 10/59页
文件大小: 0K
描述: IC MPU 32BIT CORE 233MHZ 416-BGA
标准包装: 40
系列: Interprise™
处理器类型: MIPS32 32-位
速度: 233MHz
电压: 1.2V
安装类型: 表面贴装
封装/外壳: 416-BGA
供应商设备封装: 416-PBGA(27x27)
包装: 托盘
其它名称: 79RC32K438-233BBI
18 of 59
May 25, 2004
IDT 79RC32438
AC Timing Definitions
Below are examples of the AC timing characteristics used throughout this document.
Figure 2 AC Timing Definitions Waveform
Symbol
Definition
Tper
Clock period.
Tlow
Clock low. Amount of time the clock is low in one clock period.
Thigh
Clock high. Amount of time the clock is high in one clock period.
Trise
Rise time. Low to high transition time.
Tfall
Fall time. High to low transition time.
Tjitter
Jitter. Amount of time the reference clock (or signal) edge can vary on either the rising or falling edges.
Tdo
Data out. Amount of time after the reference clock edge that the output will become valid. The minimum time represents the data output hold.
The maximum time represents the earliest time the designer can use the data.
Tzd
Z state to data valid. Amount of time after the reference clock edge that the tri-stated output takes to become valid.
Tdz
Data valid to Z state. Amount of time after the reference clock edge that the valid output takes to become tri-stated.
Tsu
Input set-up. Amount of time before the reference clock edge that the input must be valid.
Thld
Input hold. Amount of time after the reference clock edge that the input must remain valid.
Tpw
Pulse width. Amount of time the input or output is active for asynchronous signals.
Tslew
Slew rate. The rise or fall rate for a signal to go from a high to low, or low to high.
X(clock)
Timing value. This notation represents a value of ‘X’ multiplied by the clock time period of the specified clock. Using 5(CLK) as an example:
X = 5 and the oscillator clock (CLK) = 25MHz, then the timing value is 200.
Tskew
Skew. The amount of time two signal edges deviate from one another.
Table 4 AC Timing Definitions
Tdz
Tzd
Tdo
Tpw
Thld
Tsu
Tlow
Thigh
Tper
clock
Output signal 1
Output signal 2
Input Signal 1
Signal 1
Tjitter
Trise
Tfall
Tdo
Signal 2
Signal 3
Tskew
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