IOB Pad Input/Output/3-State

Spartan-7 FPGAs Data Sheet: DC and AC Switching Characteristics (DS189)

Document ID
DS189
Release Date
2022-10-31
Revision
1.10 English

Table: IOB High Range (HR) Switching Characteristics summarizes the values of standard-specific data input delay adjustments, output delays terminating at pads (based on standard) and 3-state delays.

·TIOPI is described as the delay from IOB pad through the input buffer to the I-pin of an IOB pad. The delay varies depending on the capability of the SelectIO input buffer.

·TIOOP is described as the delay from the O pin to the IOB pad through the output buffer of an IOB pad. The delay varies depending on the capability of the SelectIO output buffer.

·TIOTP is described as the delay from the T pin to the IOB pad through the output buffer of an IOB pad, when 3-state is disabled. The delay varies depending on the SelectIO capability of the output buffer. In HR I/O banks, the IN_TERM termination turn-on time is always faster than TIOTP when the INTERMDISABLE pin is used.

Table  17:   IOB High Range (HR) Switching Characteristics

I/O Standard

TIOPI

TIOOP

TIOTP

Units

VCCINT Operating Voltage and Speed Grade

1.0V

0.95V

1.0V

0.95V

1.0V

0.95V

-2

-1

-1L

-2

-1

-1L

-2

-1

-1L

LVTTL_S4

1.34

1.41

1.41

3.93

4.18

4.18

3.96

4.20

4.20

ns

LVTTL_S8

1.34

1.41

1.41

3.66

3.92

3.92

3.69

3.93

3.93

ns

LVTTL_S12

1.34

1.41

1.41

3.65

3.90

3.90

3.68

3.91

3.91

ns

LVTTL_S16

1.34

1.41

1.41

3.19

3.45

3.45

3.22

3.46

3.46

ns

LVTTL_S24

1.34

1.41

1.41

3.41

3.67

3.67

3.44

3.68

3.68

ns

LVTTL_F4

1.34

1.41

1.41

3.38

3.64

3.64

3.41

3.65

3.65

ns

LVTTL_F8

1.34

1.41

1.41

2.87

3.12

3.12

2.90

3.13

3.13

ns

LVTTL_F12

1.34

1.41

1.41

2.85

3.10

3.10

2.88

3.12

3.12

ns

LVTTL_F16

1.34

1.41

1.41

2.68

2.93

2.93

2.71

2.95

2.95

ns

LVTTL_F24

1.34

1.41

1.41

2.65

2.90

2.90

2.68

2.91

2.91

ns

LVDS_25

0.81

0.88

0.88

1.41

1.67

1.67

1.44

1.68

1.68

ns

MINI_LVDS_25

0.81

0.88

0.88

1.40

1.65

1.65

1.43

1.66

1.66

ns

BLVDS_25

0.81

0.88

0.88

1.96

2.21

2.21

1.99

2.23

2.23

ns

RSDS_25 (point to point)

0.81

0.88

0.88

1.40

1.65

1.65

1.43

1.66

1.66

ns

PPDS_25

0.81

0.88

0.88

1.41

1.67

1.67

1.44

1.68

1.68

ns

TMDS_33

0.81

0.88

0.88

1.54

1.79

1.79

1.57

1.80

1.80

ns

PCI33_3

1.32

1.39

1.39

3.22

3.48

3.48

3.25

3.49

3.49

ns

HSUL_12_S

0.75

0.82

0.82

1.93

2.18

2.18

1.96

2.20

2.20

ns

HSUL_12_F

0.75

0.82

0.82

1.41

1.67

1.67

1.44

1.68

1.68

ns

DIFF_HSUL_12_S

0.76

0.83

0.83

1.93

2.18

2.18

1.96

2.20

2.20

ns

DIFF_HSUL_12_F

0.76

0.83

0.83

1.41

1.67

1.67

1.44

1.68

1.68

ns

MOBILE_DDR_S

0.84

0.91

0.91

1.80

2.06

2.06

1.83

2.07

2.07

ns

MOBILE_DDR_F

0.84

0.91

0.91

1.51

1.76

1.76

1.54

1.77

1.77

ns

DIFF_MOBILE_DDR_S

0.78

0.85

0.85

1.82

2.07

2.07

1.85

2.09

2.09

ns

DIFF_MOBILE_DDR_F

0.78

0.85

0.85

1.57

1.82

1.82

1.60

1.84

1.84

ns

HSTL_I_S

0.75

0.82

0.82

1.74

1.99

1.99

1.77

2.01

2.01

ns

HSTL_II_S

0.73

0.80

0.80

1.54

1.79

1.79

1.57

1.80

1.80

ns

HSTL_I_18_S

0.75

0.82

0.82

1.41

1.67

1.67

1.44

1.68

1.68

ns

HSTL_II_18_S

0.75

0.81

0.81

1.54

1.79

1.79

1.57

1.80

1.80

ns

DIFF_HSTL_I_S

0.76

0.83

0.83

1.71

1.96

1.96

1.74

1.98

1.98

ns

DIFF_HSTL_II_S

0.76

0.83

0.83

1.63

1.88

1.88

1.66

1.90

1.90

ns

DIFF_HSTL_I_18_S

0.79

0.86

0.86

1.51

1.76

1.76

1.54

1.77

1.77

ns

DIFF_HSTL_II_18_S

0.78

0.85

0.85

1.58

1.84

1.84

1.61

1.85

1.85

ns

HSTL_I_F

0.75

0.82

0.82

1.22

1.48

1.48

1.25

1.49

1.49

ns

HSTL_II_F

0.73

0.80

0.80

1.24

1.49

1.49

1.27

1.51

1.51

ns

HSTL_I_18_F

0.75

0.82

0.82

1.26

1.51

1.51

1.29

1.52

1.52

ns

HSTL_II_18_F

0.75

0.81

0.81

1.24

1.49

1.49

1.27

1.51

1.51

ns

DIFF_HSTL_I_F

0.76

0.83

0.83

1.30

1.56

1.56

1.33

1.57

1.57

ns

DIFF_HSTL_II_F

0.76

0.83

0.83

1.33

1.59

1.59

1.36

1.60

1.60

ns

DIFF_HSTL_I_18_F

0.79

0.86

0.86

1.33

1.59

1.59

1.36

1.60

1.60

ns

DIFF_HSTL_II_18_F

0.78

0.85

0.85

1.33

1.59

1.59

1.36

1.60

1.60

ns

LVCMOS33_S4

1.34

1.41

1.41

3.93

4.18

4.18

3.96

4.20

4.20

ns

LVCMOS33_S8

1.34

1.41

1.41

3.65

3.90

3.90

3.68

3.91

3.91

ns

LVCMOS33_S12

1.34

1.41

1.41

3.21

3.46

3.46

3.24

3.48

3.48

ns

LVCMOS33_S16

1.34

1.41

1.41

3.52

3.77

3.77

3.55

3.79

3.79

ns

LVCMOS33_F4

1.34

1.41

1.41

3.38

3.64

3.64

3.41

3.65

3.65

ns

LVCMOS33_F8

1.34

1.41

1.41

2.87

3.12

3.12

2.90

3.13

3.13

ns

LVCMOS33_F12

1.34

1.41

1.41

2.68

2.93

2.93

2.71

2.95

2.95

ns

LVCMOS33_F16

1.34

1.41

1.41

2.68

2.93

2.93

2.71

2.95

2.95

ns

LVCMOS25_S4

1.20

1.27

1.27

3.26

3.51

3.51

3.29

3.52

3.52

ns

LVCMOS25_S8

1.20

1.27

1.27

3.01

3.26

3.26

3.04

3.27

3.27

ns

LVCMOS25_S12

1.20

1.27

1.27

2.60

2.85

2.85

2.63

2.87

2.87

ns

LVCMOS25_S16

1.20

1.27

1.27

2.94

3.20

3.20

2.97

3.21

3.21

ns

LVCMOS25_F4

1.20

1.27

1.27

2.87

3.12

3.12

2.90

3.13

3.13

ns

LVCMOS25_F8

1.20

1.27

1.27

2.30

2.56

2.56

2.33

2.57

2.57

ns

LVCMOS25_F12

1.20

1.27

1.27

2.29

2.54

2.54

2.32

2.55

2.55

ns

LVCMOS25_F16

1.20

1.27

1.27

2.13

2.39

2.39

2.16

2.40

2.40

ns

LVCMOS18_S4

0.83

0.89

0.89

1.74

1.99

1.99

1.77

2.01

2.01

ns

LVCMOS18_S8

0.83

0.89

0.89

2.30

2.56

2.56

2.33

2.57

2.57

ns

LVCMOS18_S12

0.83

0.89

0.89

2.30

2.56

2.56

2.33

2.57

2.57

ns

LVCMOS18_S16

0.83

0.89

0.89

1.65

1.90

1.90

1.68

1.91

1.91

ns

LVCMOS18_S24

0.83

0.89

0.89

1.72

1.98

1.98

1.75

1.99

1.99

ns

LVCMOS18_F4

0.83

0.89

0.89

1.57

1.82

1.82

1.60

1.84

1.84

ns

LVCMOS18_F8

0.83

0.89

0.89

1.80

2.06

2.06

1.83

2.07

2.07

ns

LVCMOS18_F12

0.83

0.89

0.89

1.80

2.06

2.06

1.83

2.07

2.07

ns

LVCMOS18_F16

0.83

0.89

0.89

1.52

1.77

1.77

1.55

1.79

1.79

ns

LVCMOS18_F24

0.83

0.89

0.89

1.46

1.71

1.71

1.49

1.73

1.73

ns

LVCMOS15_S4

0.86

0.93

0.93

2.18

2.43

2.43

2.21

2.45

2.45

ns

LVCMOS15_S8

0.86

0.93

0.93

2.21

2.46

2.46

2.24

2.48

2.48

ns

LVCMOS15_S12

0.86

0.93

0.93

1.71

1.96

1.96

1.74

1.98

1.98

ns

LVCMOS15_S16

0.86

0.93

0.93

1.71

1.96

1.96

1.74

1.98

1.98

ns

LVCMOS15_F4

0.86

0.93

0.93

1.97

2.23

2.23

2.00

2.24

2.24

ns

LVCMOS15_F8

0.86

0.93

0.93

1.72

1.98

1.98

1.75

1.99

1.99

ns

LVCMOS15_F12

0.86

0.93

0.93

1.47

1.73

1.73

1.50

1.74

1.74

ns

LVCMOS15_F16

0.86

0.93

0.93

1.46

1.71

1.71

1.49

1.73

1.73

ns

LVCMOS12_S4

0.95

1.02

1.02

2.69

2.95

2.95

2.72

2.96

2.96

ns

LVCMOS12_S8

0.95

1.02

1.02

2.21

2.46

2.46

2.24

2.48

2.48

ns

LVCMOS12_S12

0.95

1.02

1.02

1.91

2.17

2.17

1.94

2.18

2.18

ns

LVCMOS12_F4

0.95

1.02

1.02

2.10

2.35

2.35

2.13

2.37

2.37

ns

LVCMOS12_F8

0.95

1.02

1.02

1.66

1.92

1.92

1.69

1.93

1.93

ns

LVCMOS12_F12

0.95

1.02

1.02

1.51

1.76

1.76

1.54

1.77

1.77

ns

SSTL135_S

0.75

0.82

0.82

1.47

1.73

1.73

1.50

1.74

1.74

ns

SSTL15_S

0.68

0.75

0.75

1.43

1.68

1.68

1.46

1.69

1.69

ns

SSTL18_I_S

0.75

0.82

0.82

1.79

2.04

2.04

1.82

2.06

2.06

ns

SSTL18_II_S

0.75

0.82

0.82

1.43

1.68

1.68

1.46

1.70

1.70

ns

DIFF_SSTL135_S

0.76

0.83

0.83

1.47

1.73

1.73

1.50

1.74

1.74

ns

DIFF_SSTL15_S

0.76

0.83

0.83

1.43

1.68

1.68

1.46

1.69

1.69

ns

DIFF_SSTL18_I_S

0.79

0.86

0.86

1.80

2.06

2.06

1.83

2.07

2.07

ns

DIFF_SSTL18_II_S

0.79

0.86

0.86

1.51

1.76

1.76

1.54

1.77

1.77

ns

SSTL135_F

0.75

0.82

0.82

1.24

1.49

1.49

1.27

1.51

1.51

ns

SSTL15_F

0.68

0.75

0.75

1.19

1.45

1.45

1.22

1.46

1.46

ns

SSTL18_I_F

0.75

0.82

0.82

1.24

1.49

1.49

1.27

1.51

1.51

ns

SSTL18_II_F

0.75

0.82

0.82

1.24

1.49

1.49

1.27

1.51

1.51

ns

DIFF_SSTL135_F

0.76

0.83

0.83

1.24

1.49

1.49

1.27

1.51

1.51

ns

DIFF_SSTL15_F

0.76

0.83

0.83

1.19

1.45

1.45

1.22

1.46

1.46

ns

DIFF_SSTL18_I_F

0.79

0.86

0.86

1.35

1.60

1.60

1.38

1.62

1.62

ns

DIFF_SSTL18_II_F

0.79

0.86

0.86

1.33

1.59

1.59

1.36

1.60

1.60

ns

Table: IOB 3-state Output Switching Characteristics specifies the values of TIOTPHZ and TIOIBUFDISABLE. TIOTPHZ is described as the delay from the T pin to the IOB pad through the output buffer of an IOB pad, when 3-state is enabled (i.e., a high impedance state). TIOIBUFDISABLE is described as the IOB delay from IBUFDISABLE to O output. In HR I/O banks, the internal IN_TERM termination turn-off time is always faster than TIOTPHZ when the INTERMDISABLE pin is used.

Table  18:   IOB 3-state Output Switching Characteristics

Symbol

Description

VCCINT Operating Voltage and Speed Grade

Units

1.0V

0.95V

-2

-1

-1L

TIOTPHZ

T input to pad high-impedance.

2.19

2.37

2.37

ns

TIOIBUFDISABLE

IBUF turn-on time from IBUFDISABLE to O output.

2.30

2.60

2.60

ns