MAX14890E Datasheet, PDF (7/30 Pages) Maxim Integrated Products – Overvoltage and Undervoltage Fault Detection

MAX14890E
Incremental Encoder Interface for RS-422,
HTL, and TTL with Digital Inputs
Switching Characteristics (continued)
(V_CC = 5V±10%, V_L = 1.62V to V_CC, T_A = -40°C to +125°C unless otherwise noted. Typical values are at V_CC = 5V, V_L = 3.3V,
T_A = +25°C.) (Notes 2, 3)
PARAMETER
SYMBOL
CONDITIONS
MIN
DI Receiver Propagation Delay
Skew |t_{DPLH_DY} - t_{DPHL_DY}|
t_{RSKEW_DY}
DI mode, C_L = 15pF, 0V ≤ V_IN ≤ +24V,
Figures 1, 2
0
DI Maximum Glitch Duration for
Glitch Rejection
t_GL
DI/TTLY is high or low
DI Admitted Pulse Duration
t_{PASS DI/TTLY is high or low}
300
RECEIVER (DI2, DI3) (Note 5)
Digital Input (DI) Maximum
Switching Rate
SR_DI
DI mode
20
DI Propagation Delay
t_{DPLH_DI}
t_{DPHL_DI}
DI mode, C_L = 15pF, 0V ≤ V_IN ≤ +24V,
Figures 1, 2
DI Receiver Propagation Delay
Skew (t_{DPLH_DI} - t_{DPHL_DI})
t_{RSKEW_DI} DI mode, C_L = 15pF
Maximum Glitch Duration for Glitch
Rejection
t_GL
DI mode, DI/TTL_ is high or low
Admitted Pulse Length
t_PASS DI mode, DI/TTL_ is high or low
350
TTL Maximum Switching Rate
SR_{DI_TTL} TTL mode
20
TTL Receiver Propagation Delay
t_{DPLH_DITTL TTL mode, CL = 15pF, 0V ≤ VIN ≤ +5V,}
t_{DPHL_DITTL} ^{Figures 1, 2}
TTL Receiver Propagation Delay
Skew (t_{DPLH_DITTL} - t_{DPHL_DITTL})
t_{HLSKEW_}
DITTL
TTL mode, C_L = 15pF, Figures 1, 2
FAULT DETECTION (AFAULT, BFAULT, ZFAULT, D2FAULT/IRQ, D3FAULT/SDO) (Note 5)
TYP
60
80
MAX UNITS
100
ns
80
ns
ns
kHz
5
μs
5
ns
80
ns
ns
kHz
5
μs
5
ns
Differential Fault Propagation
Delay to _FAULT Output Active
Differential Slew Rate to Avoid
Fault Alarm Output
Single Ended Propagation Delay
to _FAULT Output Active
t_DFLH
t_DFHL
R_FAULT = 5kΩ,
C_FAULT = 15pF,
RS-422 and DHTL
modes, Figures 1, 4
FLTR = 0
FLTR = 1
FLTR = 0
FLTR = 1
R_FAULT = 5kΩ, C_FAULT = 15pF, FLTR = 0,
RS-422 and D-HTL modes, Figures 1, 4
1
t_SEFLH
t_SEFHL
R_FAULT = 5kΩ, C_FAULT = 15pF, all modes
18
1400
6
1400
1.4
1.4
μs
V/μs
ms
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