参数资料
型号: SAA5491H/NNN
厂商: NXP SEMICONDUCTORS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 12 MHz, MICROCONTROLLER, PQFP80
封装: 14 X 20 MM, 2.80 MM HEIGHT, PLASTIC, SOT-318-2, QFP-80
文件页数: 58/72页
文件大小: 498K
代理商: SAA5491H/NNN
1998 Dec 14
61
Philips Semiconductors
Preliminary specication
Economy teletext and TV microcontrollers
SAA5x9x family
13 CHARACTERISTICS FOR THE I2C-BUS INTERFACE
Notes
1. This parameter is determined by the user software. It must comply with the I2C-bus specification.
2. This value gives the auto-clock pulse length which meets the I2C-bus specification for the special crystal frequency.
Alternatively, the SCL pulse must be timed by software.
3. The rise time is determined by the external bus line capacitance and pull-up resistor. It must be less than 1
s.
4. The maximum capacitance on bus lines SDA and SCL is 400 pF.
SYMBOL
PARAMETER
INPUT
OUTPUT
I2C-BUS SPECIFICATION
SCL timing
tHD;STA
START condition hold time
≥4.0 s
note 1
≥4.0 s
tLOW
SCL LOW time
≥4.7 s
note 1
≥4.7 s
tHIGH
SCL HIGH time
≥4.0 s
≥4.0 s; note 2 ≥4.0 s
trC
SCL rise time
≤1.0 s
note 3
≤1.0 s
tfC
SCL fall time
≤0.3 s
≤0.3 s; note 4 ≤0.3 s
SDA timing
tSU;DAT1
data set-up time
≥250 ns
note 1
≥250 ns
tHD;DAT
data hold time
≥0 ns
note 1
≥0ns
tSU;STA
repeated START set-up time
≥4.7 s
note 1
≥4.7 s
tSU;STO
STOP condition set-up time
≥4.0 s
note 1
≥4.0 s
tBUF
bus free time
≥4.7 s
note 1
≥4.7 s
trD
SDA rise time
≤1.0 s
note 3
≤1.0 s
tfD
SDA fall time
≤0.3 s
≤0.3 s; note 4 ≤0.3 s
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