
7480 Group and 7481 Group User's Manual
1-190
HARDWARE
1.21 Electrical Characteristics
1.21.2 Necessary Conditions for Timing and Switching Characteristics
Table 1.21.13 lists the necessary conditions for timing and the switching characteristics of the 7480 Group
and 7481 Group, and Figure 1.21.1 shows the timing diagram.
Table 1.21.13 Necessary Conditions for Timing and Switching Characteristics (Note)
0.2VCC
0.8VCC
tc(SCLK)
tWL(SCLK)
tWH(SCLK)
td(SCLK-TXD)
RXD
SCLK
TXD
tsu(RXD-SCLK)th(SCLK-RXD)
Figure 1.21.1 Timing Diagram
1.21.3 Typical Characteristics of Power Source Current
The typical characteristics of the power source current
described in this section are based on a limited
number of samples in the 7480 Group and 7481
Group. ‘Typical values’ are not guaranteed.
For the limits, refer to section 1.21.1 Electrical
Characteristics.
Figure 1.21.2 shows a measurement circuit of typical
power source current characteristics.
ICC
A
7480 Group
7481 Group
VCC
VSS
0 to 5.5V
XOUT
XIN
Figure 1.21.2 Measurement Circuit of Typical Power
Source Current Characteristics
Unit
ns
Max.
100
Min.
2000
880
160
80
500
220
Typ.
Note: Values at VCC = 4.5 V to 5.5 V, VSS = 0 V, Ta = –40
°C to 85°C, and f(XIN) = 8 MHz
Limits
Symbol
tC(SCLK)
tWH(SCLK)
tWL(SCLK)
tSU(RxD–SCLK)
th(SCLK–RxD)
td(SCLK–TxD)
tC(SCLK)
tWH(SCLK)
tWL(SCLK)
Parameter
Serial I/O clock input cycle time
Serial I/O clock input HIGH pulse width
Serial I/O clock input LOW pulse width
Serial I/O input set-up time
Serial I/O input hold time
Serial I/O output delay time
Serial I/O clock input cycle time
Serial I/O clock input HIGH pulse width
Serial I/O clock input LOW pulse width
Clock
synchronous
UART