F1953 Datasheet

© 2022 Renesas Electronics Corporation

5

February 9, 2022

PARALLEL CONTROL MODE

The user has the option of running in one of two parallel modes: Direct Parallel Mode or Latched Parallel

Mode.

DIRECT-PARALLEL MODE:

Direct-parallel mode is selected when VMODE (pin 13) is < VIL and LE (pin 5) is > VIH. In this mode the

device will immediately react to any voltage changes to the parallel control pins [pins 1, 15, 16, 17, 19, 20].

Use direct-parallel mode for the fastest settling time.

LATCHED-PARALLEL MODE:

Latched-parallel mode is selected when VMODE (pin 13) is < VIL and LE (pin 5) is toggled from < VIL to > VIH

To utilize latched-parallel mode:



Set LE < VIL



Adjust pins [1, 15, 16, 17, 19, 20] to the desired attenuation setting. (Note the device will not react

to these pins while LE < VIL.)



Pull LE > VIH. The device will then transition to the attenuation settings reflected by these pins.

When the device is powered up In Latched Parallel Mode [VMODE < VIL and LE > VIH] the attenuation setting

defaults to the state defined by the six parallel data pins [pins 1, 15, 16, 17, 19, 20]

LATCHED PARALLEL MODE TIMING DIAGRAM: (Note the Timing Spec Intervals in Blue)

LATCHED PARALLEL MODE TIMING TABLE:

Interval

Symbol

Description

Min

Spec

Max

Spec

Units

A

Serial to Parallel Mode Setup Time

100

ns

B

Parallel Data Hold Time

10

ns

C

LE minimum pulse width

10

ns

D

Parallel Data Setup Time

10

ns

D[5:0]

Data Word

Latched into

Active Register

LE

VMODE

Spec

Interval

A

D

C

B