Motorola MC68VZ328 Manuale Utente

19-2

Table 19-2 contains both maximum and minimum DC characteristics of the MC68VZ328.

The AC characteristics consist of output delays, input setup and hold times, and signal skew times. All 
signals are specified relative to an appropriate edge of other signals. All timing specifications are specified 
at an operating frequency from 0 MHz to 33 MHz with an operating supply voltage from V

DD min

 to 

V

DD max

 under an operating temperature from T

L

 to T

H

. All timing is measured at 95 pF loading.

Figure 19-1 on page 19-3 compares the chip-select signal time referenced with the CLKO signal. Note that 
WS is the number of wait states in the current memory access cycle. The signal values and units of 
measure for this figure are found in Table 19-3 on page 19-3. For detailed information about the individual 
signals, see Chapter 6, “Chip-Select Logic.” 

1

Full running operating current at 33 MHz

—

20

40

mA

2

Standby current

1

1.Standby current is measured only when the real-time clock is running.

—

35

60

µ

A

V

IH

Input high voltage

0.7 V

DD

—

—

V

V

IL

Input low voltage

—

—

0.4

V

V

OH

Output high voltage (I

OH

= 2.0 mA)

0.7 V

DD

—

—

V

V

OL

Output low voltage (I

OL

= -2.5 mA)

—

—

0.4

V

I

IL

Input low leakage current 
(V

IN

= GND, no pull-up or pull-down)

—

—

±1

µ

A

I

IH

Input high leakage current 
(V

IN

= V

DD

, no pull-up or pull-down)

—

—

±1

µ

A

I

OH

Output high current 
(V

OH

= 0.8 V

DD

, V

DD

= 2.9 V)

4.0

—

—

mA

I

OL

Output low current 
(V

OL

= 0.4V, V

DD

= 2.9 V)

—

—

-4.0

mA

I

OZ

Output leakage current 
(V

out

= V

DD

, output is three-stated)

—

—

±5

µ

A