7477 datasheet(218/354 Pages) RENESAS

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7470/7471/7477/7478 GROUP USER’S MANUAL

HARDWARE

1.20 Electrical characteristics

1-201

(2) 7477/7478 group timing requirements, switching characteristics

Table 1.20.18 shows the timing requirements and switching characteristics of the 7477/7478 group.

Figure 1.20.2 shows the timing chart.

Table 1.20.18 Timing requirements and switching characteristics (7477/7478 group)

(VCC = 4.5 V to 5.5 V, VSS = 0V, Ta = –20 °C to +85°C, f(XIN) = 8 MHz)

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 “H” pulse width

Serial I/O clock input “L” 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 “H” pulse width

Serial I/O clock input “L” pulse width

Unit

Limits

Max.

Typ.

Min.

2000

880

160

500

220

100

Fig. 1.20.2 Timing chart (7477/7478 group)

0.2VCC

0.8VCC

tc(SCLK)

tWL(SCLK)

tWH(SCLK)

td(SCLK-TXD)

RXD

SCLK

TXD

tsu(RXD-SCLK)th(SCLK-RXD)

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