Maxim-integrated DS80C390 Manual de usuario descargar pdf (Pagina 43)

DS80C390

43 of 58 110199

MULTIPLEXED 9 CYCLE DATA MEMORY 3-CE0 WRITE

ELECTRICAL CHARACTERISTICS (Non-multiplexed address/data bus)

40 MHz VARIABLE CLOCK

PARAMETER SYMBOL MIN MAX MIN MAX UNITS

Oscillator Freq. (Ext. Osc) 1 / t

CLCL

0 40 0 40 MHz

(Ext. Crystal) 1 40 1 40

PSEN Pulse Width

PLPH

0.5 t

MCS

- 5 ns

PSEN Low to Valid Instruction In

PLIV

0.5 t

MCS

- 20 ns

Input Instruction Hold after PSEN

PXIX

0 0 ns

Input Instruction Float after PSEN

PXIZ

See MOVX

characteristics

Port 1 Address, Port 4 CE to

Valid Instruction In

AVIV1

0.75 t

MCS

- 20 ns

Port 2, 4 Address to Valid

Instruction In

AVIV2

0.875 t

MCS

- 25 ns

NOTES FOR AC ELECTRICAL CHARACTERISTICS:

1. All parameters apply to both commercial and industrial temperature operation unless otherwise noted.

2. The value t

MCS

is a function of the machine cycle clock in terms of the processor’s input clock

frequency. These relationships are described in the “Stretch Value Timing” table.

3. All signals characterized with load capacitance of 80 pF except Port 0, ALE, PSEN, RD and WR

with 100 pF.

4. Interfacing to memory devices with float times (turn off times) over 25 ns may cause bus contention.

This will not damage the parts, but will cause an increase in operating current.

5. Specifications assume a 50% duty cycle for the oscillator. Port 2 timing will change in relation to

duty cycle variation.

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 57 58

Comentarios a estos manuales

Sin comentarios

Maxim-integrated DS80C390 Manual de usuario Pagina 43

Comentarios a estos manuales

Relacionado con productos y manuales para Hardware Maxim-integrated DS80C390