Datasheet

MAX3140
SPI/MICROWIRE-Compatible UART with Integrated
True Fail-Safe RS-485/RS-422 Transceivers
4 _______________________________________________________________________________________
UART SWITCHING CHARACTERISTICS
(V
CC
= +5V ±5%, f
XTL
= 1.8432MHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are measured with V
CC
= +5V,
UART configured for 9600 baud, T
A
= +25°C.) (Note 1)
CONDITIONS UNITSMIN TYP MAXSYMBOLPARAMETER
C
LOAD
= 100pF ns100t
DV
CS Low to DOUT Valid
C
LOAD
= 100pF, R
CS
= 10kΩ ns100t
TR
CS High to DOUT Tri-State
ns0t
CSH
CS to SCLK Hold Time
ns100t
CSS
CS to SCLK Setup Time
ns100t
DS
DIN to SCLK Setup Time
ns238t
CP
SCLK Period
ns0t
DH
DIN to SCLK Hold Time
C
LOAD
= 100pF ns100t
DO
SCLK Fall to DOUT Valid
ns100t
CL
SCLK Low Time
ns200t
CS1
CS Rising Edge to SCLK
Rising
ns100t
CS0
SCLK Rising Edge to CS
FaIling
TX, RTS, DOUT; C
LOAD
= 100pF
ns10t
r
Output Rise Time
TX, RTS, DOUT, IRQ; C
LOAD
= 100pF
ns10t
f
Output Fall Time
ns200t
CSW
CS High Pulse Width
ns100t
CH
SCLK High Time
UART AC TIMING (Figure 1)