MC34921 Datasheet, PDF (14/36 Pages) List of Unclassifed Manufacturers – Configurable Motor Driver IC with Power Supplies

DYNAMIC ELECTRICAL CHARACTERISTICS
DYNAMIC ELECTRICAL CHARACTERISTICS
Table 4. Dynamic Electrical Characteristics
Characteristics noted under conditions 16 V ≤ B+ ≤ 34 V, 0°C ≤ T_A ≤ 70°C, and 0°C ≤ T_J ≤ 100°C unless otherwise noted.
Typical values noted reflect the approximate parameter means at T_A = 25°C under nominal conditions unless otherwise noted.
Characteristic
Symbol
Min
Typ
Max
Unit
Serial Interface Timing⁽²²⁾
Setup Time for CE to rising edge of SCLK (C_L = 50 pF)
Hold Time for CE after falling edge of SCLK (C_L = 50 pF)
Setup Time for MOSI to rising edge of SCLK (C_L = 50 pF)
Hold Time for MOSI after falling edge of SCLK (C_L = 50 pF)
Delay for MISO valid after rising edge of SCLK (C_L = 50 pF)
Period for SCLK (C_L = 50 pF)
Duty Cycle of SCLK
5.0 V Switching Regulator
t _{setup (CE)}
–
15
–
ns
t _{hold (CE)}
–
15
–
ns
t _{setup (MOSI)}
–
15
–
ns
t _{hold ( MOSI)}
–
15
–
ns
t _{delay (MISO)}
–
35
55
ns
t _{period (SCLK)}
125
–
750
ns
t_{duty (SCLK)}
45
–
55
%
Switching Rise and Fall Time
Load Resistance = 100 Ω, B+ = 18 V
t_r, t_f
ns
10
30
50
3.3 V Switching Regulator
Switching Rise and Fall Time
Load Resistance = 100 Ω, B+ = 18 V
t_r, t_f
ns
10
16
50
Motor Drivers
Motor Drivers A and B Output Waveform Rise Time
R = 7.0 Ω, V_DCX = (5.0 V) to (0.90 x B+), B+ = 18 V
t_r
ns
100
175
300
Motor Driver C Output Waveform Rise Time
R = 25 Ω, V_DCX = (5.0 V) to (0.90 x B+), B+ = 18 V
t_r
ns
100
175
300
Output Waveform Fall Time
V_DCX = (0.90 x B+) to 5.0 V, R = 7.0 Ω, B+ = 18 V
Crossover Dead Time ⁽²³⁾
Motor Driver C in Step Mode
t_f
t _dead
ns
100
–
300
15
600
2000
ns
Output Rise Time
V_XPHASE = 5.0 V to 0.90 x B+, R_w = 20 Ω, B+ = 18 V
t_r
ns
100
175
350
Output Fall Time
V_XPHASE = 0.90 x B+ to 5.0 V, R_w = 20 Ω, B+ = 18 V
t_f
ns
100
155
350
Delay from Phase Turn-Off to Counterphase Turn-On
t_{delay (C)}
ns
R_w = 20 Ω, 0.90 x B+ Rising to 0.90 x B+ Falling, B+ = 18 V Falling
0.0
300
400
Notes
22. See Figure 4, Serial Interface Timing, page 16.
23. This parameter is guaranteed by design but not production tested.
34921
14
Analog Integrated Circuit Device Data
Freescale Semiconductor