10

February 2007

Document Control #ML0004 Rev 0.3

STK22C48

HARDWARE PROTECT

The STK22C48 offers hardware protection against

ing low-voltage conditions. When V

WRITE

s are inhibited.

AutoStore can be completely disabled by tying V

CCX

to ground and applying + 5V to V

initiated by explicit request using the HSB pin.

LOW AVERAGE ACTIVE POWER

The STK22C48 draws significantly less current

when it is cycled at times longer than 50ns. Figure 5

shows the relationship between I

time. Worst-case current consumption is shown for

perature range, V

enable). Figure 6 shows the same relationship for

WRITE

cycles. If the chip enable duty cycle is less

than 100%, only standby current is drawn when the

chip is disabled. The overall average current drawn

by the STK22C48 depends on the following items: 1)

CMOS

enable; 3) the overall cycle rate for accesses; 4) the

Figure 5: Icc (max) Reads

0

20

40

60

80

100

50

100

150

200

Cycle Time (ns)

TTL

CMOS

0

20

40

60

80

100

50

100

150

200

Cycle Time (ns)

TTL

CMOS