MAX5427(2002) データシートの表示（PDF） - Maxim Integrated

部品番号

コンポーネント説明

メーカー

MAX5427
(Rev.:2002)

One-Time Programmable, Linear-Taper Digital Potentiometers

Maxim Integrated 

One-Time Programmable, Linear-Taper

Digital Potentiometers

U/D

11V

VPP

0V

CS

tCH

tPC

tCL

5 BITS RECORD WIPER POSITION

tCP

tPH

OPTIONAL LOCKOUT BIT

Figure 4. One-Time Program Mode Serial Interface Timing Diagram

It is recommended that the user either use six CS puls-

es (convert to a fixed voltage-divider) or five pulses

(program the initial power-up value of the device, but

still be able to adjust the wiper). If the device is pro-

grammed with five pulses and later it is desired to dis-

able the interface (convert to a fixed voltage-divider),

then care must be taken to ensure that the wiper is in

the same position as it was originally set to (when pro-

grammed with five pulses). The full six programming

pulses must be applied. If the wiper is not in its original

programmed position prior to disabling the interface,

the final locked-out position is correct. Note that once

the six-pulse program occurs, no further programming

is possible.

The VPP power supply must be able to source at least

5mA and have a good transient response. The VPP power

supply should be decoupled with 22µF and have no more

than 250µH of inductance and/or 40Ω of parasitic resis-

tance between the capacitors and the device (Figure 5).

The device does not require decoupling capacitors near

VPP, provided the above guidelines are met.

VPP = 11V

22µF

TRACE PARASITICS

LPARASITIC

< 250µH

RPARASITIC

< 40Ω

VPP

MAX5427

MAX5428

MAX5429

Figure 5. VPP Power-Supply Connection

Chip Information

TRANSISTOR COUNT: 2270

PROCESS: BiCMOS

_______________________________________________________________________________________ 7

Share Link: